Volume 11 - American Academy of Forensic Sciences

Transcription

AMERICAN ACADEMY OF FORENSIC SCIENCES
410 North 21st Street
PO Box 669
Colorado Springs, CO 80901-0669
Phone: (719) 636-1100
Fax: (719) 636-5245
E-mail: membship@aafs.org
Website: www.aafs.org
PROCEEDINGS
of the American Academy of Forensic Sciences
The Proceedings of the American Academy of Forensic Sciences is an official publication of the American Academy of
Forensic Sciences (AAFS). It is devoted to the publication of the abstracts of technical oral papers and posters presented at the
AAFS annual meeting. These include various branches of the forensic sciences such as pathology, toxicology, physical
anthropology, psychiatry, immunology, odontology, jurisprudence, criminalistics, questioned documents, and engineering.
Similar submissions dealing with forensic oriented aspects of the social sciences are also included.
Please note that some of the abstracts included in the Proceedings deal with topics, results, and/or conclusions which are
controversial. The publication of abstracts does not imply that the AAFS, its sections, or the individual section program
chairs/committee has verified or agrees with the studies, results, and/or conclusions of each abstract. During the process of
planning a scientific program, it is impossible to “peer-review” each abstract and presentation to the degree that is accomplished
during manuscript review. Abstracts and presentations are accepted, in part, so that they can be critiqued and reviewed by other
scientists, and so that a forum is available to discuss controversial issues.
The views expressed in this publication are not those of the AAFS. The data and opinions appearing in the published material
were prepared by and are the responsibility of the contributor(s), not of AAFS or its respective employees, employers, officers,
and agents. The AAFS does not supply copies of meeting papers. It is suggested that you write directly to individual authors to
obtain copies of specific papers. Presentation of some abstracts may have been scheduled or canceled after the publication of this
document.
English is the official language of the AAFS and its meetings; neither oral nor written translations will be provided.
Copyright 2005 by the AAFS. Unless stated otherwise, noncommercial photocopying of editorial material published in this
periodical is permitted by AAFS. Permission to reprint, publish, or otherwise reproduce such material in any form other than
photocopying must be obtained from AAFS.
Printed in the United States of America by Publication Printers, Corp., Denver, CO.
PROCEEDINGS
of the American Academy of Forensic Sciences
Contents
Financial Disclosure Index ...........................................................1
Special Sessions ..........................................................................10
Breakfast Seminars .....................................................................12
Luncheon Seminars.....................................................................17
Workshops & Workshorts ...........................................................18
Scientific Sessions
Criminalistics.........................................................................32
Engineering Sciences...........................................................123
General.................................................................................159
Jurisprudence .......................................................................200
Odontology ..........................................................................210
Pathology/Biology ...............................................................227
Physical Anthropology ........................................................282
Psychiatry & Behavioral Science ........................................338
Questioned Documents........................................................347
Toxicology ...........................................................................357
Last Word.............................................................................377
Presenting Author Index ...........................................................382
Key Word Index ........................................................................387
February 2005
Volume XI
Financial Disclosure
As a sponsor of continuing education, the American Academy of Forensic Sciences must insure balance, independence, objectivity, and
scientific rigor in all its educational activities. All faculty participating in a sponsoring activity are expected to disclose to the activity
audience any significant financial interest or other relationship: (1) with the manufacturer(s) of any commercial product(s) and/or
provider(s) of commercial services discussed in an educational presentation, and (2) with any commercial supporters of the activity.
(Significant financial interest or other relationship can include such things as grants or research support, employee, consultant, major
stockholder, member of speaker’s bureaus, etc.) The intent of this disclosure is not to prevent a speaker with a significant financial or
other relationship from making a presentation, but rather to provide listeners with information on which they can make their own judgments. It remains for the audience to determine whether the speaker’s interest or relationships may influence the presentation with
regard to the exposition or conclusion. The executed Financial Disclosure Forms are on file in the AAFS Office.
As an accredited provider of Continuing Medical Education, the American Academy of Forensic Sciences is required to ask speakers
to disclose any real or apparent conflict of interest they may have as related to the contents of their presentation(s). The existence of
commercial or financial interests of authors related to the subject matter of their presentation(s) should not be construed as implying
bias or decreasing the value of their presentation(s), however; disclosure should help participants form their own judgments.
Authors not listed in this index indicated no affiliations with or financial interests in any commercial organizations. Those
authors who disclosed affiliations or financial interests with the commercial organizations involved with products, to which they may
refer, are listed below.
A
Ivo Alberink, PhD - D15
FearID Project (European Union Project Number G6RD-CT-200100618) (Grant/Research Support)
Boyd Allen, MASc - C2
Accident Reconstruction Computer Software
José R. Almirall, PhD - W10
NITECRIME (European Union Funded Network)
(Grant/Research Support)
Agilent
New Wave (Demonstration Equipment)
Joseph Almog, PhD - B161
Ferrotrace Mistral
TSWG (Grant/Research Support)
Michelle Alvarez, BS - B171
Technical Support Working Group (TSWG) on Counterterrorism
Donald J. Anderson, BS - W7
Stark rxp (Other Financial/Material Support)
Robert N. Anderson, PhD, PE - W7
B
Erin K. Bai, BA - K11
California Department of Justice, BFS, Toxicology Laboratory
(Other Financial/Material Support)
Cerex Polycrom Clin II Solid Phase Extraction Column SPEware
James A. Bailey, PhD - D75
Kodak Polychotrast RC Type F Photographic Paper
Lora Bailey-Van Houten, BS - B1
California State University (Grant/Research Support)
Joan E. Baker, PhD - H36
Joint POW/MIA Accounting Command (Employee)
Robert E. Barsley, DDS, JD - SS2
Florida International University (Other Financial/Material Support)
Joel Bartholf, BS - W16
3SI Security Systems (Employee)
3SI Security Systems FlexPac™
3SI Security Systems Octapus™
3SI Security Systems Scorpion®/Currency Guard
United States Currency Protection Corporation
Rachel A. Bartholomew, PhD - B2
Agilent 2100 Bioanalyzer
Qiagen RNAEasy Micro Kits
Qiagen Sensiscript Reverse Transcriptor
Edward G. Bartick, PhD - B152
Federal Bureau of Investigation (Grant/Research Support)
Permount Norland Optreal Adhesive (provided by University of
South Carolina/Federal Bureau of Investigation)
Martin Bauer, MD - B70
Applied Biosystems, Inc. Taqman® Gene Expression Assay
University of Wuerzburg (Grant/Research Support)
Adam C. Becnel, BS - SS2
Philip S.L. Beh, MBBS, DMJ - G92
HKU CRCG (Grant/Research Support)
RGC (Grant/Research Support)
Peter J. Belcastro, Jr., MFS - J19
Federal Bureau of Investigation Laboratory (Speaker’s Bureau)
Suzanne Bell, PhD - W3
Prentice Hall/Pearson Education (Other Financial/Material Support)
Jason Berger, MS - B68
Applied Biosystems, Inc. ABI Prism® 3100 Genetic Analyzer
Promega PowerPlex®16
Joan M. Bienvenue, MS
Federal Bureau of Investigation (Grant/Research Support) – B78, B100
National Institute of Health (Grant/Research Support) – B78
Applied Biosystems, Inc. ABI 310 Genetic Analyzer – B100
Applied Biosystems, Inc. COfiler® - B100
Applied Biosystems, Inc. Profiler® Kits – B100
Applied Biosystems, Inc. POP-4 Polymer – B100
Sherie A. Blackwell, BSc - F29
University of Melbourne School of Dental Science (Employee)
Laser Scanning (provided by Scanning and Inspection Pty., Ltd.)
Herbert L. Blitzer, AB, MBA - D32
National Institute of Justice (Grant/Research Support)
Cherisse Boland - B80
Applied Biosystems, Inc. (Employee)
Applera Corporation AB Design
Applera Corporation iscience
Applera Corporation iscience Design
Applera Corporation FAM®
Applera Corporation NED®
Applera Corporation PET®
Applera Corporation Quantifiler™
Applera Corporation YFiler™
Applied Biosystems, Inc. ABI Prism®
Applied Biosystems, Inc. AmpFlSTR® Identifiler™
Applied Biosystems, Inc. GeneScan®
Applied Biosystems, Inc. GeneMapper®
Applied Biosystems, Inc. Genotyper®
Applied Biosystems, Inc. LIZ®
Applied Biosystems, Inc. VIC®
1
Susan A. Bollinger, DDS - F7
Adobe® Photoshop®
Richard S. Brown, MS - C45
MVA Scientific Consultants (Employee)
Light and Electron Microscopy (provided by MVA Scientific
Consultants)
Sherry Brown, MS - W3
Aaron L. Brudenelle, MS - W3
Cynthia Brzozowski, DMD - F22
Adobe® Photoshop®
Microsoft® Access
Microsoft® Visual Basic
WinBite
Rebecca A. Bullard, BA, MS - G53
University of California, Davis (Grant/Research Support)
JoAnn Buscaglia, PhD - W10
Agilent
C
Pamela A. Cadiente - D46
Acuvue® Contact Lenses
Baush & Laumb Contact Lenses
Focus Dailies® Contact Lenses
Chelex® (provided by Applied Biosystems, Inc.)
USDE Ronald E. McNair Scholars Summer Research Institute Grant
P217A030070 (Grant/Research Support)
Lisa M. Calandro, MPH - B143
Applera Corporation iscience Design
Applera Corporation Yfiler™
Applied Biosystems, Inc. AmpFlSTR®
Applied Biosystems, Inc. Identifiler™
Applied Biosystems, Inc. LIZ®
Carlo P. Campobasso, MD, PhD - G45
Doctoral Program in “Forensic Pathology and Criminalistics
Techniques” (Grant/Research Support)
Theresa A. Caragine, PhD - B71
Office of the Chief Medical Examiner of the City of New York
(Other Financial/Material Support)
Titan Inc. (Other Financial/Material Support)
Beckman-Coulter Biomek 2000 Robot
Promega DNA IQ™
Strip Testing (provided by Raven Laboratories)
Eric J. Carita, MS - B107
NIJ (Grant/Research Support)
Applied Biosystems, Inc. COfiler® STR Kits
Applied Biosystems, Inc. Genescan®
Applied Biosystems, Inc. Profiler Plus®
2
John M. Carson, DDS - F13
Lumen Software Forensic IQ
Joe S. Cecil, PhD, JD - W7
Mario J. Cellarosi, BA, MS - C58
National Institute of Standards and Technology (Employee)
Salih Cengiz, PhD - B86
Research fund of Istanbul University (Grant/Research Support)
Chien-Wei Chang, PhD - B16
Applera Corporation Quantifiler™ Real-Time PCR Kits
Applied Biosystems, Inc. AmpFlSTR® Yfiler™ Kit
Konstantinos H. Cherpelis, DDS - F18
WinID (provided by the OCME City of New York)
Adobe® Photoshop® (provided by the OCME City of New York)
Helen Cho, PhD - W2
Leica Microsystems Microscopes (Demonstration Equipment)
Steven C. Clark, PhD - D40
National Association of Medical Examiners (Consultant)
Brandi L. Clelland - D70
John T. Cody, PhD - K3
Dexedrine
United Chemical Technologies, Inc XRDAH203 High Flow
200-mg Columns
United Chemical Technologies, Inc XtracktT®
Kenneth Cohrn, DDS - F27
Adobe® Photoshop®
Edward J. Cone, PhD - K29
OraSure Technologies (Consultant)
Oral Fluid Testing Device (provided by OraSure Technologies)
Laura M. Conner, BS - D21
Bacharach TLV Sniffer
Portable Arson Sampler
tpi Pocket Combustable Gas Leak Detector
Gail A. Cooper, PhD - K15
Cozart Biosciences, Ltd. (Employee)
Cozart EIA Cannabinoids Microplate Kit
Gilbert E. Corrigan, MS, MD, PhD - G64
Microsoft®: Word
Microsoft® Visio
Sulekha R. Coticone, PhD - B96
California State University Fresno Seed Grant (Grant/Research Support)
Applied Biosystems, Inc. AmpFlSTR® Profiler Plus®ID™
Applied Biosystems, Inc. GeneMapper®ID
Katie L. Coy, BS - B103
Applied Biosystems, Inc. AmpFlSTR® Profiler Plus®
Natasha E. Coyle, MSc, PhD - D51
Applied Biosystems, Inc. ABI Prism® Genetic Analyzer
Applied Biosystems, Inc. Identifiler®
Applied Biosystems, Inc. PCR Amplification Kit
Christine L. Craig, MS - B32
ESDA2
Foster and Freeman Electrostatic Dust Print Lifter
Sirchie
David R. Craig, BS - C40
The Gas Technology Institute (Grant/Research Support)
Rhonda Craig, MS - B102
Clorox® Bleach
Fluorescein (provided by Gabor Patonay/Georgia State University)
JOY® Dishwashing Detergent
Sharon R. Crowley, RN, MN, FCNS - G83
CooperSurgical/Leisegang, Inc. (Other Financial/Material Support)
Leisegang Colposcope CooperSurgical/Leisegang, Inc.
D
Jon C. Dailey, DDS - F10
ToothPrints® (provided by Kerr Dental)
Marie Danforth, PhD, MA, AB - H63
University of Southern Mississippi (Grant/Research Support)
Jon M. Davoren, MS - B134
International Commission on Missing Persons - ICMP (Employee)
Promega PowerPlex®16 System
SeFiler Kits (provided by ICMP)
Nunzio Di Nunno, MD, PhD - G29
Bari University (Grant/Research Support)
Promega SV Total RNA Isolation
Giancarlo Di Vella, MD, PhD - G76
.25 Caliber Baby Browning
BMW
Taylor M. Dickerson, MS - B67
Bio-Rad 5% Chelex®
Promega DNA IQ™
Promega PowerPlex® 16
Qiagen QIAamp™
James J. DiSarno, MS - SS2
J.C. Upshaw Downs, MD - G80
.17 HMR round CCI Ammunition – G79
Century International Arms Tokarev CZ52 7.62 Pistol - G80
Jason P. Doyle, MFS - D62
NCIS Forensic Consultant Division (Employee)
Spex Forensics Mini-Crimescope 400
Matthew J. Ducote, PhD - B11
Bio101® Soil DNA Extraction Kits
BioVentures, Inc. Soil DNA Extraction Kits
Epicentre® Soil DNA Extraction Kits
MoBio Laboratories Soil DNA Extraction Kits
Qiagen Soil DNA Extraction Kits
Diana A. Dupuis, BA - H3
Forensic Sciences Foundation (Grant/Research Support)
E
Gavin R. Edmondstone, BSc - B57
Centre of Forensic Sciences (Employee)
Jim Ehleringer, PhD - W10
Agilent (Demonstration Equipment)
Lim Eng Seng Simon, BS - B144
Reliagene Technologies, Inc. Y-Plex™12
Heather L. Erek, BS - B106
Orchid Cellmark (Employee)
Max B. Erwine, BS - W15
SPE Products & Techniques (Unlabeled Pharmaceutical/Investigational/
Medical Device)
Varian, Inc. (Employee)
Varian, Inc. SPE Phases
* Presenting Author
Sheila M. Estacio, BA
NYC OCME (Employee) – B146
Florida International University (Other Financial/Material Support) – SS2
Applied Biosystems, Inc. ABI Prism® 3100 Genetic Analyzer – B146
Applied Biosystems, Inc. Quantiblot – B146
Bio RAD Micro Bio-Spin Chromatography Columns – B146
Promega DNA IQ – B146
Promega PowerPlex®16 – B146
F
Lisa Faber, MFS - B63
NIJ No-Suspect Case DNA Backlog Reduction Program
David R. Fisher, BS - B128
Roche Linear Array Mitochondrial DNA HVI/HVII RegionSequence Typing Kit
Erica L. Fleishaker - B147
NIJ 2002-IJ-CX-K007 (Grant/Research Support)
Corbett Research Rotor-Gene RG3000
Millipore Microcon® YM-30
Carolyn J. Fowler, PhD, MPH - D61
Microsoft® SQL Software (provided by Johns Hopkins Bloomberg
School of Public Health)
Bethany G. Fox - B14
P217A030070 (Grant/Research Support)
Donna Freid, MA - H20
FORDISC Computer Software (provided by University of Tennessee,
Knoxville)
Amanda K. Frohwein, BS - SS2
Michael E. Frontz, MSFS - K13
Bexar County Medical Examiner’s Office (Employee)
Pennzoil-Quaker State Snap Brake Fluid
G
Robert E. Gaensslen, PhD - W3
Zeno J. Geradts, PhD – C19, D17
Ministry of Justice (Employee)
Eugene Giles, PhD - H21
FORDISC 2.0 (provided by Forensic Anthropology Center)
Ingrid A. Gill, JD
Ancestry (provided by DNA DNAPrint Genomics, Inc.) - BS1
Applied Biosystems, Inc. - E4
Bode Technologies - E4
DNAPrint Genomics - E4
Forensic Science Associates - E4
Mitotyping Technologies - E4
Orchid Cellmark - E4
Promega - E4
ReliaGene, Inc. - E4
Technical Associates - E4
Justin M. Godby, BS - G54
MUFSC, WVDHHR/DSDC/OLS (Grant/Research Support)
NASBA (provided by WVDHHR/DSC/OLS)
Kenneth W. Goddard, MS - SS2
Christopher M. Gojcz, BS - SS2
Julie E. Golden, MS - B97
Applied Biosystems, Inc., Inc. ABI Prism® 310 Genetic Analyzer
Applied Biosystems, Inc., Inc. AmpFlSTR®
Applied Biosystems, Inc., Inc. Cofier/Profiler Plus®
3
Eleanor A.M. Graham, MSc - B72
National Society for the Prevention of Cruelty to Children, UK
Applied Biosystems, Inc., Inc. ABI Prism® 377 DNA Sequencer
Applied Biosystems, Inc., Inc. AmpFlSTR® SGM+® PCR
Amplification Kit
Bio-Rad Laboratories Chelex® 100 Resin
Molecular Probes Oligreen® ssDNA
Martin Grassberger, MD, PhD - G3
Agrobiogen TypiFix System ™Tags
Phillip H. Grimm, BS - W16
United States Currency Protection Corporation (Employee)
H
Ashley M. Hall, MS - B170
National Institute of Justice, University of Central Florida
Joy L. Halverson, DVM - D58
DNA Typing Services QuestGen Forensics
David B. Harte, DMD - D26
Toothprints® (provided by Kerr Corporation)
Lotte Henke, PhD - B164
Katherine Henkelman - B108
Cedar Crest College (Grant/Research Support)
Promega SE33 Kit
Lori K. Hennessy, PhD - B142
Applera iscience Design
Applera Corporation Quantifiler ™
Applera Corporation Yfiler™
Applied Biosystems, Inc. AmpFLSTR®
Applied Biosystems, Inc. Identifiler®
Applied Biosystems, Inc. LIZ™
Applied Biosystems, Inc. PCR Amplification Kit
Nicholas Hermann, PhD - W20
FORDISC (provided by the University of Tennessee)
SAS (provided by the University of Tennessee)
SYSTAT (provided by the University of Tennessee)
Jeffrey A. Hickey, MS - B138
Applied Biosystems, Inc. Taqman®
Promega PowerPlex® Y
Ashley J. Hinkle, BS - B95
Marshall University Forensic Science Center (Grant/Research Support)
Applied Biosystems, Inc. ABI 7000 Sequence Detection System
Applera Corporation Quantifiler™ Human DNA Quantification Kit
Applera Corporation Quantifiler™ Y Human Male Quantification Kit
Qiagen Qiamp DNA Blood Mini Kit
Thomas D. Holland, PhD - W23
JPAC Central Identification Laboratory (Employee)
4
Bart Hoogeboom, MS - C18
3D Studio Max Software
Jurian A. Hoogewerff, PhD - W10
Agilent
Katie M. Horsman, MS - B137
Applera Corporation, Inc. Quantifiler™ Y
Applied Biosystems, Inc. Primer Express®
Applied Biosystems, Inc. Quantiblot™
Kyle A. Hoskins, BS - B102
Clorox® Bleach
Max M. Houck, MA - B59
NIJ (Grant/Research Support) – B59
Prentice Hall/Pearson Education (Other Financial/Material Support) – W3
Rosalyn G. Huss, BS, RN - C49
Legal Nurse Services (provided by Center for Toxicology and
Environmental Health, LLC)
I
Alice R. Isenberg, BA, MS, PhD - B132
Federal Bureau of Investigation Laboratory (Employee)
J
Jack L. Jacobia - D32
Richard L. Jantz, PhD - W20
Cassie L. Johnson, MS - B99
Applied Biosystems, Inc. Y-Filer
Promega PowerPlex® Y
Kristen Johnson, BS - B108
Promega SE33 Kit
Kimberley A. Johnston, MSc
Government of Ontario (Employee) – B114, E19
Roger W. Jones, PhD - J6
Agilent Technologies HPLC pumps
Agilent Technologies HPLC column
Digilab
Finnigan
FT-IR Spectrometer
HPLC/FT-IR Interface
Lab Connections
Mass Spectrometer
Micro-Tech
Susan W. Jones, PhD, MFS - B69
Department of Defense (Grant/Research Support)
Applied Biosystems, Inc., Inc, Taqman®
Idaho Technologies, Inc Thermocyclers
MJ Research, Inc.
Chelsey A. Juarez, BA - H37
University of California at Santa Cruz, UCSC Chicano Latino Resource
Center (Grant/Research Support)
Jane S. Juusola, BS - B172
* Presenting Author
K
Michelle Kaye, MA - H44
Forensic Sciences Foundation Lucas Research Grant
Janine A. Kelly, MSc - D38
National Research Foundation (NRF), South Africa
Ronald L. Kelly, BS - W16
Julie B. Kempton, MS, MFS - B167
Prince George’s County Police Department (Employee)
Nam Yee Kim, PhD - K8, K12
National Institute of Scientific Investigation (Speaker’s Bureau)
Rebecca J. Kirby - G68
Ferris Faculty Grant (Grant/Research Support)
Walter E. Klippel, PhD - H1
Department of Justice Law Enforcement Innovation Center
Eva E. Klonowski, PhD - H75
Katherine A. Koen - D50
Federal Bureau of Investigations (Grant/Research Support)
Jason C. Kolowski, MS - B130
Fisher Scientific
LabCorp, Co.
Mideo Systems, Inc.
Roche Applied Science
Rijad Konjhodzic, BS - B8
Dave Kontny - SS2
Robert D. Koons, PhD - W10
Agilent
Benjamin E. Krenke, MS - B139
Promega (Employee)
L
Marrah E. Lachowicz, MFS - SS2
Amrita Lal-Paterson, MSFS - B76
ReliaGene Technologies, Inc. (Employee)
Qiagen EZ1, M48
Christopher Latkoczy, PhD - W10
Agilent
Marc A. LeBeau, MS - W16
Benoît Leclair, PhD - B110
Applied Biosystems, Inc. ChargeSwitch™
* Presenting Author
Cheng-Lung Lee, MFS - B115
Applied Biosystems, Inc. AFLP Plant Mapping Kit
Qiagen, Inc.Plant DNeasy Extraction Kit
Mark D. Leney, PhD - B129
Joint POW/MIA Accounting Command (Employee)
Chris Lennard, PhD
ChemImage Condor Chemical Imaging System – B25, B148
Digilab FTIR Imaging Sprectrometer with a 64x64 MCT Detector – B29
Polilight VCS-2000
Foster & Freeman (VCS2000) – B25
Dan Levitt, DDS - F18
Linda A. Lewis, PhD - W3
Jih-Heng Li, Dr - B52
National Bureau of Controlled Drugs Department of Health
Ling Li, MD - G71
NICHD (Grant/Research Support)
Richard Li, PhD - B5
Sam Houston State University (Grant/Research Support)
Eng Seng Simon Lim, BS - B3
Health Sciences Authority - Singapore (Employee)
Applied Biosystems, Inc. Genotyper™
Promega Powerplex® 16
Whatman®, FTA™ Collection Card
Wen-Ling Lin, PhD - G70
IFM 91-T06 (Grant/Research Support)
Laura L. Liptai, PhD - W7
Amanda L. Lokar, BA, BS - D4
New Orleans Police Department Scientific Criminal Investigation
Division (Other Financial/Material Support)
Nikon 5700 (provided by New Orleans Police Department Scientific
Criminal Investigation Division)
Pentax K1000 (provided by New Orleans Police Department Scientific
Criminal Investigation Division)
Kodak 35mm Film (provided by New Orleans Police Department
Scientific Criminal Investigation Division)
Compact Flash Card (provided by New Orleans Police Department
Scientific Criminal Investigation Division)
Katherine E. Long, BS - B166
Extraction, Amplification, Electrophoresis, and Analysis of STR DNA
(provided by Applied Biosystems, Inc. and Millipore)
José A. Lorente, MD, PhD - B101
Whatman FTA® Paper
Applied Biosystems, Inc. Identifiler Kit™
José A. Lorente, MD, PhD - B9
Whatman (Grant/Research Support)
Whatman FTA® Paper
M
Vahid Majidi, PhD - SS2
Joseph J. Maltese, JD, MJS - W7
Holland Maness, BS - F3
ToothPrints® (provided by Kerr Dentistry)
Mary H. Manhein, MA - SS2
Julia Martin, MD - F27
Adobe® Photoshop®
5
Paul Martin, PhD - B20
CRAIC Technologies (Employee)
CRAIC Technologies UV-Visible-NIR Microspectrophotometers
JoAnne Marzowski, PhD - B34
Alpharma USPD Inc. Triple Antibiotic Ointment
Ansell Healthcare Products Inc. Lifestyle Condoms Ultra Sensitive
With Spermacide
Avon Products Inc. Skin So Soft Lotion
Body Shop International Cocoa Butter Moisturizing Stick
Clinique Laboratories Inc. Clinique Daily Face Protectant
Dayton Hudson Corp. Target Allergy Cream
Inter-American Products Inc. Hydrocortisone Cream
Johnson and Johnson Consumer Products, Inc. K-Y Jelly
Kendall Company Kendall Thermazene
Loreal USA Inc. Loreal Future Moisturizer
Neutrogena Corp. Neutrogena Oil Free Moisturizer
Neutrogena Corp. Neutrogena Sunblock SPF 45
Schering Plough HealthCare Products Inc. A+D Original Ointment
Schering Plough HealthCare Products Inc. Coppertone Sport
Sunblock SPF 15
Schering Plough HealthCare Products Inc. Coppertone Sport
Sunblock SPF 30
St. Ives Laboratories Inc. Extra Relief Advanced therapy Lotion
Bruce R. McCord, BS, PhD - K28
Kirstin McDonald, BA, BS - B125
Alden Leeds, Inc., Maxibrom
Alden Leeds, Inc., nu-clo® 7 Day Tablets
Alden Leeds, Inc., nu-clo® Concentrated Granules
Clorox Company Clorox® Automatic Bowl Cleaner
Global Household Brands X-14 Anti-Bacterial Toilet Bowl Cleaner
Housechem American Fare® Automatic Toilet Bowl
Cleaner with Bleach
Housechem RiteAid Automatic Toilet Bowl Cleaner with Bleach
Rickett & Colman Sani-Flush® Bleach Puck Plus® Automatic
Toilet Bowl Cleaner
WD-40 Company 2000 Flushes® Bleach Automatic Bowl Cleaner
Richard W. McLay, PhD, PE - W7
Sara McNorton, MS - B58
Atomobile Body Fillers
Automobile Spot Fillers
Terry Melton, PhD - B131
Mitotyping Technologies (Employee)
James R. Millette, PhD - C42
Microscopical Analysis (provided by MVA Scientific Consultants)
Lisa M. Misner, MS - B127
Andre A. Moenssens, JD, LLM - W7
Shirly Montero, PhD
(Grant/Research Support) – W10
Agilent – W10
Foster & Freeman Grim II – B159
New Wave (Demonstration Equipment) – W10
New Wave UP-213 Laser Ablation System – B159
Perkin Elmer ICP DRC Plus – B159
Stephen L. Morgan, PhD - B151
Keith Morris, PhD - W3
Robert J. Morton, MS - D41
Federal Bureau of Investigation (Other Financial/Material Support)
6
Robert F. Mothershead II, MA - W16
Dawn M. Mulhern, PhD - W2
Stacey Murnyak, BS - B146
NYC OCME Department of Forensic Biology (Employee)
Applied Biosystems, Inc. Quantiblot
Bio RAD Micro Bio-Spin Chromatography Columns
Promega DNA IQ
N
Huma Nasir, BS - B140
Applera Corporation Quantifiler™Y
Reliagene Technologies, Inc. Y-Plex™12
Adam Negrusz, PhD, DSc - W15
SPE Products & Techniques (Unlabeled/Investigational Use)
Varian, Inc. (Employee)
Varian, Inc. SPE Phases
Kristin N. Nestor, BS, BS - B15
TSWG (Grant/Research Support)
Alexander A. Nieuwland, PhD - B150
Beckman-Coulter Biomek 2000 Workstation
Beckman-Coulter P/ACE MDQ Capillary Electrophoresis System
Waters Micromass Q-Tof Micromass Spectrometer
Henry C. Nipper, PhD - K5
Zeneca Pharmaceuticals Seroquel (Quetiapine Fumarate)
H. Dale Nute, PhD - B47
Florida State University, Panama City (Employee)
Metal Detector (Unlabeled Pharmaceutical/Investigational/
Medical Device)
O
William R. Oliver, MD - D27
Multiple Web Pages
Databases
Kerry L. Opel, MA, BS - B147
NIJ 2002-IJ-CX-K007 (Grant/Research Support)
Corbett Research Rotor-Gene RG3000
Millipore Microcon® YM-30
Stephen D. Ousley, PhD
University of Tennessee, Knoxville (Consultant) - H22
FORDISC (provided by the University of Tennessee) – H22, W20
SAS (provided by the University of Tennessee) – W20
SYSTAT (provided by the University of Tennessee) – W20
P
Robert R. Paine, PhD - W2
Frank J. Pappas, DDS - F18
Robert F. Pastor, PhD - H35
The British Academy (Grant/Research Support)
* Presenting Author
Gabor Patonay, PhD - B102
Clorox® Bleach
Jeanette M. Perr, BS - SS2
Donn N. Peterson, MSME, PE - W7
Joseph L. Peterson, DCrim - B62
Bureau of Justice Statistics (Grant/Research Support)
Jerome L. Podorski, BS - SS2
Natasha H. Poe, BS - B82
Applera Corporation Quantifiler™ Human DNA Quantification Kits
Applied Biosystems, Inc., Inc. AmpFlSTR® Profiler Plus™
Applied Biosystems, Inc., Inc. AmpFlSTR® Coflier™ PCR
Amplification Kits
Applied Biosystems, Inc. GeneScan® Analysis Software
Applied Biosystems, Inc. Genotyper® Analysis Sofware
Applied Biosystems, Inc. Quantiblot® Human DNA Quantification Kits
The Bode Technology Group, Inc. Buccal DNA Collector
Fitzco, Inc. Omni Swab Collector
Fitzco, Inc. Sampact™
Pur-Wrap® Sterile Dacron® Swab (provided by Fitzco, Inc.)
Qiagen, Inc. QIAmp® DNA Mini Kit
Whatman® Indicating FTA® Micro Card (provided by Fitzco, Inc.)
Mark M. Pollitt, MS - D13
University of Tulsa (Consultant)
Maja Popovic, PhD - B75
ReliaGene Technologies, Inc. (Employee)
Applied Biosystems, Inc. 9700 GeneAmp® PCR System
Qiagen BioRobot 8000 DNA Extraction System
Qiagen Biorobot Liquid Handling System
Wallace DBS Puncher (provided by Perkin Elmer)
Klaus Poulsen, MD - G85
Siemens CT-Scanner Somatom Plus4
Chang En Pu, MS - D53
Investigation Bureau, Ministry of Justice, Taiwan (Speaker’s Bureau)
Genotyping Results (provided by Applied Biosystems, Inc.)
Ken Pye, PhD - W10
Agilent
Michael P. Rickenbach, PhD - W16
Bernd Rieger, Dipl.-Phys. - D28
Adobe® Photoshop®
Microsoft® Windows®
Lovelle M. Rimando - D49
USDE Grant #P217A030070. (Grant/Research Support)
Applied Biosystems, Inc. 377 XL DNA Sequencer (provided by the
University of Hawaii
BLAST Search Engine (Unlabeled Pharmaceutical/Investigational/
Medical Device)
GenBank (Unlabeled Pharmaceutical/Investigational/Medical Device)
Carol J. Ritter, MS - B108
Promega SE33 Kit
James M. Robertson, PhD - B12
Federal Government (Grant/Research Support)
James M. Robertson, PhD - B104
Federal Government (Grant/Research Support)
Bayer Actril®
Susan J. Roe, MD - G18
Bush Foundation Medical Fellows Program (Grant/Research Support)
G. Sue Rogers, MSFS - B111
Hitachi FMBIO®
Promega PowerPlex®
Douglas E. Rohde, MS - K39
Merck Merckoquant® Cyanide Test
Ann H. Ross, PhD - H18
North Carolina State University Grant (Grant/Research Support)
Linda C. Rourke, MSFS, MPhil - B168
Amersham Biosciences 500 GenomiPhi Kit
Lenny Rudin, PhD - D16
Cognitch (Grant/Research Support)
Investigator Services (provided by Cognitech)
Susanna Rudy, RN, MSFS
Labock Technologies, Inc. One-Way(TM) Bullet Resistant Glass – B112
Pyng Medical Corporation F.A.S.T. 1™ Intraosseous System – D2
Q
S
Thomas Quatieri, PhD - D33
United States Government TSWG Air Force contract F19628-00C-0002 (Grant/Research Support)
Kenneth Saczalski, PhD - C11
Bruce R. Pfaff & Associates (Grant/Research Support)
Butler, Wooten, Fryhofer, Daughtery, & Sullivan
Douthit, Frets, Rouse & Gentile (Grant/Research Support)
Lowe, Eklund, Wakefield & Mulvihill (Grant/Research Support)
Stong & Associates (Grant/Research Support)
Nermin Sarajlic, MD - H70
International Commission on Missing Persons (Employee)
Vincent J. Sava, MA - W23
Michael I. Schaffer, PhD - K31
Psychemedics Corporation (Employee)
Hair Analysis (provided by Psychemedics Corporation)
Heather J. Schafstall, MS - W3
R
J. Graham Rankin, PhD - B116
Machelle A. Reid, MFS - J15
Hewlett-Packard Company
Pamela C. Reynolds, BS - W16
* Presenting Author
7
Kenneth G. Schoenly, PhD - G50
Susan Scholl, MS - W3
Rebecca L. Schuler, BS
ChemImage Corporation (Employee) – D23, D71
ChemImage Corporation CI Print Macroscopic Chemical
Imaging System - D71
ChemImage Corporation Fiber Database – D23
Microtrace Corporation Fiber Database – D23
Jeffrey Schweitzer, PhD - B162
National Aeronautics and Space Administration
David V. Scott, JD - W7
Ronald Scott - W16
3SI Security Systems (Employee)
Jennifer Sears - B108
Promega SE33 Kit
James A. Sebestyen, BS - B65
Office of Chief Medical Examiner (Speaker's Bureau)
Dacron® (provided by Office of the Chief Medical Examiner)
Corbett Research Rotor-Gene™ 3000 (provided by Office of the Chief
Medical Examiner)
Beckman-Coulter Biomek 2000 (provided by Office of the Chief
Medical Examiner)
Microcon 100 (provided by Office of the Chief Medical Examiner)
Ismail M. Sebetan, MD, PhD - B109
Applied Biosystems, Inc. AmpFlSTR® Profiler Plus® PCR
Amplification Kit
Carl M. Selavka, PhD - B162
National Aeronautics and Space Administration
Arijana Selmanovic, BS - B4
Applera Corporation Quantifiler™ Human DNA Quantification Kits
Applied Biosystems, Inc. ABI Prism® 310 DNA Sequencers
Applied Biosystems, Inc. ABI Prism® 3100 DNA Sequencers
Applied Biosystems, Inc. ABI 7000 Sequence Detection System
Promega® PowerPlex®16
Roche Molecular Systems, Inc. Taq Gold®
Heather J. Seubert, BS - B102
Clorox® Bleach
Kimberley Sharpe, MSc - B74
Applied Biosystems, Inc. AmpFlSTR® Profiler Plus®
Applied Biosystems, Inc. ABI Prism® 377 DNA Sequencer
Applied Biosystems, Inc. Genescan® Analysis
Applied Biosystems, Inc. Genotyper® Software
Kai-Ping Shaw, MD, PhD - G70
IFM 91-T06 (Grant/Research Support)
Claire E. Shepard, MS - SS2
Robin Shick - B108
Promega SE33 Kit
8
Michael E. Sigman, PhD - B41
Michael E. Sigman, PhD - B49
Kelli Sikorski - W3
Ronald L. Singer, MS - SS2
David E. Sipes, MS - B98
Tecan Genesis Robot
Qiagen DNA Extraction Kit
Lejla Smajlovic, BS - B6
International Commission on Missing Persons (Employee)
Applera Corporation Quantifiler™ Human DNA Quantification Kit
Applied Biosystems, Inc. ABI Prism® 7000 Sequence Detection System
Applied Biosystems, Inc. ABI GeneAmp® PCR System 9700
Promega PowerPlex® 16
Keri L. Smith - B13
San Jose State University College of Applied Sciences and Arts
Sorenson Microcentrifuge Tubes
Amanda C. Sozer, PhD - B77
Louisiana State Police Crime Laboratory (Grant/Research Support)
Pur-Wraps® sterile Dacron® Polyster-Tipped Applicator
(provided by Fitzco, Inc.)
Non-Contact Buccal Swab Laser-Cutting Instrument (Unlabeled
Pharmaceutical/Investigational/Medical Device)
Henry A. Spiller, MS - K20
Pfizer Visine®
M. Kate Spradley, MA - W20
Nicole Stalter - D47
USDE P217A990159 (Grant/Research Support)
Lateefah A. Stanford, BS - C38
National Science Foundation (Grant/Research Support)
Amy R. Stefan, BS - B149
Beckman-Coulter Biomek 2000
Beckman-Coulter P/ACE MDQ Capillary Electrophoresis System
Thora S. Steffensen, MD - B21
The Icelandic Ministry of Justice (Grant/Research Support)
Robin T. Stoehr, BS - B153
National Institute of Justice Award 2001-RC-CX-K003
K. Alan Stormo, MD - G62
Quick2000 Biohazard Escape Hood
Samuel D. Stout, PhD - W2
Amanda B. Sturdevant, BS - B94
ATF-NLC (Other Financial/Material Support)
3M Scotch-Hutchinson Tape
Other Scotch Hutchinson Tape Products
Dale A. Sutherland, CChem - B119
Activation Laboratories, Ltd. (Employee)
Anjali R. Swienton, MFS, JD - D59
National Insitute of Justice (Grant/Research Support)
Jennifer A. Synstelien, MA - H86
Department of Justice Law Enforcement Innovation Center
* Presenting Author
T
W
Sabrina C. Ta'ala, MA - H14
Joint POW/MIA Accounting Command Central ID Lab
(JPAC/CIL) (Employee)
Allan Tereba, PhD - B73
Promega (Employee)
Promega Differential Extraction System
Mark D. Timken, PhD - B135
Applied Biosystems, Inc. STR Genotyping Kits
Mitochon Amp Kits
Roche Applied Biosciences qPCR Quantification Kits
Bridget M. Tincher, MSFS - B79
Hitachi FMBIO®
Promega PowerPlex®
Richard E. Tontarski, PhD - W3
Hugh Tuller, MA - H24
Andrew J. Tyrrell, PhD - W23
Timothy W. Waldeck, JD - W7
Margaret M. Wallace, PhD - B173
PSC-CUNY #66248-00 35 (Grant/Research Support)
Heather A. Walsh-Haney, MA - H77
University of Florida (Grant/Research Support)
Tani G. Watkins, BA - B102
Clorox® Bleach
John Watling, PhD - W10
Agilent
Gabriel D. Watts, BA - J19
Federal Bureau of Investigation Laboratory (Speaker's Bureau)
Matthew J. Weber, BSE - C2
Accident Reconstruction Computer Software
Douglas White - D14
National Institute of Standards and Technology (Employee)
Commercial Software Applications
Freeware Computer Applications
Richard Winegar, PhD - B64
Amicon® Microcon® YM-10 Centrifugal Filter Devices
Amicon® Ultrafree®-CL Centrifugal Filter Devices 0.45 mm
Amicon® Ultrafree®-CL Centrifugal Filter Devices 5.0 mm
Bio-Rad iQ™ Supermix
Bio-Rad iQ™ SYBR Green Supermix
Copan Enviro PBS TL Swab
EpiCentre® BuccalAmp™ DNA Extraction Kit
Machery-Nagel Nucleospin® DNA Trace Kit
Millipore Multiscreen™ PCR Cleanup Plate
MoBio UltraClean™ Mega Prep Soil DNA Kit
MoBio UltraClean™Soil DNA Kit
NIST Standard Reference Material® Urban Particulate Matter
Qiagen DNeasy® Tissue Kit
Qiagen QiaQuick® PCR Purification Kit
Pluronic®F-68
Matt C. Wood, BS - C47
3-D Dispersion Modeling (provided by CTEH)
U
Douglas H. Ubelaker, PhD - W2
Noelle J. Umback, PhD - B141
Office of Chief Medical Examiner (Employee)
Sayuri Umpierrez, BS - B39
Foster & Freeman (Other Financial/Material Support)
Foster & Freeman LIBS System
New Wave Research Laser Ablation System
Perkin Elmer SCIEX ICP-MS System
V
Gerard J.Q. van der Peijl, PhD - B37
Alunite (provided by Riaza Mine in Spain)
Alunite (provided by Rodalquilar Mine in Spain)
Chatwood Safe
EDAX Eagle m-XRF Instrument
Europa Scientific Geo 20-20 IRMS Instrument
Botanical Services (provided by National Herbarium of the Netherlands)
IRMS Analyses (provided by Iso-Analytical, Ltd.)
Perkin Elmer ELAN 6100 DRC Plus ICPMS Instrument
Perkin Elmer OPTIMA 3000 ICP AES Instrument
Stojko Vidovic, PhD - B7
Promega PowerPlex® Human Identification Kit
William Vilensky, DO, RPh - G89
Reckitt Benckiser (Grant/Research Support)
Jessica C. Voorhees, MSc - B105
* Presenting Author
Z
Kathryn Zimmerman - G5
Millersville University Student Research Grant
Jerry A. Zweigenbaum, PhD - K27
Agilent Technologies, Inc. (Employee)
Agilent Technologies, Inc. LC/MSD TOF
9
Special Sessions
SS1
The Big Bad Wolf is Worse Than Ever:
Exploitation and Abuse of the Elderly
Carla M. Noziglia, MS*, 8513 Northwest 47 Street, Coral Springs,
FL 33067-3403; Michele E. Kestler, MS, Los Angeles Police
Department, 555 Ramirez Street, Space 270, Los Angeles, CA 90012;
Kathy Bell, MS, RN*, Tulsa Police Department, 600 Civic Center, Tulsa,
OK 74103; William L. Leaver, BS*, Los Angeles County Sheriff's
Department, 7717 Golondrinas Street, Downey, CA 90242; Ashraf
Mozyani, PharmD, PhD*, Harris County Medical Examiner's
Office, 1885 Old Spanish Trail, Houston, TX 77054; Douglas H.
Posey, Jr., MD*, JAJ Forensic Center, Harris County, Texas, 1885 Old
Spanish Trail, Houston, TX 77054; and Joseph N. Soos, BS*, Gray
Murders/Gray Crimes Project, 1981Powell Creek Court, Charlottesville,
VA 22911
Upon completion of this session, the participant should be able to
clearly identify exploitation and abuse of the elderly and understand the
scientific tools available for more effective prosecution.
This presentation will impact the forensic community and/or
humanity by better arming participants to combat elder abuse and
exploitation in investigation, evidence analysis and prosecution.
The generation labeled by Tom Brokaw as 'the greatest generation' has
survived the horrors of a world war, the holocaust, the great depression and
the atomic bomb. But another horror looms as the unscrupulous target
these vulnerable silver citizens with fraud, robbery and, at times, murder.
This workshop will provide insight in the identification of elderly
exploitation and abuse, and discuss scientific and investigative tools, and
methods which are effective to use. Too often, crimes against the elderly
are categorized as abuse when, in fact, they can be much more. The topics
focus on how the justice system, social services and the medical community are missing homicides and other crimes against the elderly. This
workshop will also demonstrate the potential unintended and intended
toxic effects of common prescription and over the counter medication with
emphasis on the pharmacokinetics and pharmacological changes in elderly.
Detecting forged signatures on documents such as wills, trusts and deeds
will be presented. The indicators and evaluation of abuse of elderly noted
in the emergency room as a result of sexual assault. The findings at postmortem examination: contracture, shaken adult syndrome, dehydration
and malnutrition will be shown. The symposium will conclude with at discussion of the investigation into the death of an 87-year-old woman who
was murdered for her estate.
Elder Abuse, Crimes Against Elderly, Elder Sexual Assault
SS2
Young Forensic Scientists Forum:
Forensic Science Outside The Box
Claire E. Shepard, MS*, 416 East Ponce De Leon Avenue, Decatur, GA
30030; Sheila M. Estacio Dennis, BA*, Office of the Chief Medical
Examiner, 520 First Avenue, New York, NY 10016; Karly Buras, MA,
Graduate Student, LSU, 3911 South Post Oak, New Orleans, LA 70131;
Allison M. Curran, BS, Florida International University, 201 Southwest
116th Avenue, Apartment 304, Pembroke Pines, FL 33025; Amanda K.
Frohwein*, 1663 Main Street Road, State Center, IA 50247; Christopher
M. Gojcz, BS*, Drug Enforcement Administration, Special Testing &
Research Laboratory, 22624 Dulles Summit Court, Dulles, VA 20166;
Marrah E. Lachowicz, MFS*, 1300 East Orange Street, Tempe, AZ
85281; Jeanette M. Perr, BS*, Florida International University, 201
Southwest 116th Avenue, Pembroke Pines, FL 33025; Robert E. Barsley,
DDS, JD*, Louisiana State University, School of Dentistry, 1100 Florida
Avenue, Box 512, New Orleans, LA 70119-2714; Adam C. Becnel, BS*,
Louisiana State Police Crime Laboratory, 376 East Airport Road, Baton
10
Rouge, LA 70806; James J. DiSarno, MS*, Drug Enforcement
Administration, Northeast Laboratory, 99 Tenth Avenue, Suite 721,
New York, NY 10011; Kenneth G. Furton, PhD, Director, International
Forensic Research Institute, Florida International University, University
Park, Miami, FL 33199; Kenneth W. Goddard, MS*, National Fish and
Wildlife Forensic Laboratory, 1490 East Main Street, Ashland, OR
97520; Dave Kontny*, Director, National Explosives Detection Canine
Program, Department of Homeland Security, Law Enforcement - Aviation
Operations, 15500 Laurel Ridge Road, Montclair, VA 22026; Vahid
Majidi, PhD*, Department of Justice, 950 Pennsylvania Avenue, NW,
Washington, DC 20530; Mary H. Manhein, MA*, Forensic Anthropology
and Computer Enhancement Services Laboratory, Louisiana State
University, Baton Rouge, LA 70803; Jerome L. Podorski, BS*, Drug
Enforcement Administration, Mid-Atlantic Laboratory, 1440 McCormick
Drive, Largo, MD 20774; and Ronald L. Singer, MS*, Tarrant County
Medical Examiner's Office, 200 Feliks Gwozdz Place, Fort Worth,
TX 76104
Following the completion of this special session, the participants
should be aware of the diversity of careers in forensic science, should
understand how to compete for the FSF Emerging Forensic Scientist
Award, should recognize the motivation behind and the guidelines for
accreditation of forensic science academic programs, and should be aware
of the realities in the field of forensic science according to young forensic
scientists and crime laboratory directors. A breakfast session and an
evening session will allow participants to mingle with students and
emerging scientists from across the nation and to establish relationships
with members for mentoring and networking. While at the breakfast
session, participants will also have a chance to learn about resumé building
and are encouraged to bring their own resumés to be critiqued. While at
the evening session participants will be able to view graduate student
posters and to mingle with their peers in a comfortable environment.
As its role in society evolves, the field of Forensic Science continues
to grow and incorporate the skills and knowledge of many different experts
and disciplines. This year's special program will bring to the forefront
some emerging forensic science fields, and consists of presentations by
established members of the forensic science community. Emphasis has
been placed on areas such as: the processing of clandestine labs, forensic
odontology, wildlife forensics, forensic anthropology, and the importance
of forensic science publications. The session will also stress the role of
forensic science in homeland security, and will serve to make emerging
forensic scientists aware of the opportunities available to them. Complete
with a discussion panel on "Forensic Science in Louisiana," the session will
give students and emerging Forensic Scientists an open forum atmosphere
in which to discuss the realities of working as a forensic scientist, and the
qualifications necessary to pursue this exciting career.
This program should appeal to individuals with a strong desire to enter
the field of forensic science as well as those with a few years of experience
within the field and looking to get ahead. The session aims to cover a wide
range of emerging fields through presentations, discussions, and interactions with new and established members of the forensic community. This
program will provide a well-rounded understanding of different areas
within forensic science.
The objectives of this year's special session are as follows:
• To introduce emerging fields in forensic science
• To provide an understanding of the Emerging Forensic
Scientist Award
• To introduce not only emerging forensic scientists but also
prospective forensic scientists to established forensic scientists
through interaction, discussions, and presentations
• To provide an opportunity for an open-forum discussion about the
opportunities for forensic science in Louisiana
• To increase involvement within the Young Forensic Scientists
Forum.
Education, Young Forensic Scientist Forum, Careers
* Presenting Author
SD1
Accreditation of Forensic Science Academic
Program Through the AAFS FEPAC
José R. Almirall, PhD*, Florida International University, Department of
Chemistry, International Forensic Research Institute, Miami, FL 33199;
Charles "Chris" Tindall, PhD*, Metropolitan State College, Department
of Chemistry, PO Box 173362, Camput Box 52, Denver, CO -8021; Betty
J. Horton, RR2, Box 145, Tower Hill, IL 62571, Max M. Houck, MA*,
West Virginia University, 886 Chestnut Ridge Road, Suite 309, PO Box
6216, Morgantown, WV 26506-6216; Susan Hart Johns, MA, Illinois
State Police, Division of Forensic Services, 630 East Washington Street,
Springfield, IL 62701-1304; Karen W. Kershenstein, PhD, 11842 Clara
Way, Fairfax Station, VA 22039; Peter M. Marone, MS, Division of
Forensic Science, 700 North 5th Street, Richmond, VA 23219; Carl
Selavka, PhD*, Massachusetts State Police Crime Laboratory, 59 Horse
Pond Road, Sudbury, MA 01776; and Jay A. Siegel, PhD*, Indiana
University, Purdue University, Chemistry, School of Science, 402 North
Blackford, LD 326 D, Indianapolis, IN 46202
After attending this presentation, attendees will understand the
process of accreditation through the AAFS FEPAC mechanism and be able
to participate in the process as a reviewer of academic programs.
Academic programs will also learn about the process of accreditation from
different perspectives.
This presentation will impact the forensic community and/or humanity
by providing participants with a better understanding of the accreditation
process and to encourage academic institutions to participate in the accreditation process. We also expect to encourage practitioners to invest in the
process by volunteering to act as site reviewers. Forensic Science education
will ultimately benefit from a bona fide accreditation process.
The mission of the FEPAC is to maintain and enhance the quality of
forensic science education through a formal evaluation and recognition of
college level academic programs. The primary function of the committee
is to develop and maintain standards and administer an accreditation
program that recognizes and distinguishes high quality undergraduate and
graduate forensic science programs.
Attendance to this session will assist academic institutions who offer
undergraduate and graduate degree programs in forensic science to prepare
for the AAFS accreditation process through the Forensic Science
Education Programs Commission (FEPAC). The session will also assist
future site reviewers (academic and practitioners) in the preparation for the
on-site reviews of academic programs.
Accreditation of Academic Programs in Forensic Science,
FEPAC/AAFS, Special Session
ES1
Complex Forensic Science Issues
in Highly Controversial Cases
Michael M. Baden, MD*, New York State Police, Building 22, State
Campus, Albany, NY 12226; Henry Lee, PhD*, Division of Scientific
Services, Connecticut Department of Public Safety, 278 Colony Street,
Meriden, CT 06456; and Cyril H. Wecht, MD, JD*, Allegheny County,
542 Fourth Avenue, Pittsburgh, PA 15219
The goals of this presentation are to assist attendees with the ability to
objectively review and analyze forensic scientific issues; and to provide a
better understanding of potential pitfalls involved in complex civil and
criminal trials.
by increasing understanding of relationships among forensic scientists, law
enforcement agencies and attorneys.
There are varying degrees of exactitude associated with each of the
acknowledged fields of forensic science. However, none of these areas of professional expertise constitutes an absolute science. Accordingly, conflicting
* Presenting Author
views, even to the point of seemingly antithetical conclusions and opinions,
may be encountered in any particular civil or criminal lawsuit.
For various reasons, the more multi-faceted, controversial, and nationally
publicized a particular case may be, the more likely are there to be highly conflicting opinions from acknowledged medical and forensic scientific experts.
While this may be a source of consternation and even intellectual concern to
many people, there is nothing inherently inappropriate or professionally
unethical in such a situation. Reasonable, intelligent, and highly experienced
experts may arrive at different conclusions in any particular case. Of course,
the fact that the adversarial system is the universally accepted method of litigation trial technique in the United States, undoubtedly serves to foment and
exaggerate these divergent viewpoints.
This discussion will be designed to illustrate and perhaps explain how
serious and significant differences among various forensic science experts
may arise in nationally prominent cases. Presentations will include factual
analyses of several such matters of recent vintage, including the Scott
Peterson, Kobe Bryant, Jayson Williams cases and several others.
Different perspectives will be discussed in order to ensure objectivity and
fairness.
Forensic Scientific Analysis, Complex Litigation, Adversarial System
ES2
Requirements for Investigations into
Allegations of Serious Negligence or
Misconduct in Forensic Science Laboratories
Joseph P. Bono, MA, Office of Forensic Sciences, Drug
Enforcement Administration, 2401 Jefferson Davis Highway
Alexandria, VA 22301; Kenneth E. Melson, JD, United States
Attorney's Office, 2100 Jamieson Avenue, Alexandria, VA
22314; Barry Scheck, Cardozo Law School, 55 Fifth Avenue
New York, NY; and Peter Neufeld; Attorney at Law; 99 Hudson
Street; New York, NY
During the past few years there have been a number of accusations
directed at forensic science laboratories. These accusations have involved
claims of negligence, misconduct or technical/analytical mistakes in the
analyses of physical evidence with the result being possible miscarriages of
justice. To the credit of many laboratories, there is a practice of self-disclosure when evidence of such impropriety exists. In most cases, the
problems are addressed, notifications are made, justice is served and the
integrity of the laboratory stays intact. In other cases, that is not the
outcome.
Now the federal government has mandated formal state government
oversight to resolve these accusations. The Paul Coverdell Forensic
Sciences Improvement Grant Program (FSIGP) was expanded by the
108th Congress to require that a state, as a condition of receiving federal
funding for crime laboratories, certify that a formal, governmental process
is in place to conduct independent external investigations of its laboratories. These investigations are to occur when there are allegations of
serious negligence or misconduct substantially affecting the integrity of the
forensic results committed by employees or contractors of any forensic laboratory system, medical examiner's office, coroner's office, law
enforcement storage facility, or medical facility in the state that receives a
grant under the Program.
This presentation will offer an open and full discussion of the
requirement for external investigations, the type of government entities that
will oversee the investigations, the parameters of the investigations, and the
effect on other quality assurance program obligations. The panel will
consist of representatives of the Innocence Project at Cardozo Law School,
who participated in drafting the amendment's language, and of
ASCLD/LAB.
Negligence, Misconduct, Forensic Science Laboratories
11
Breakfast Seminars
BS1
The One Drop Rule: Is It Time
For Science Rather Than Law to
Define Race in America?
BS2
The Pseudo-Medical Examiner and
the Determination of Mode of Death:
A Case History
Ingrid A. Gill, JD*, 4835 North Kenmore Street, Chicago, IL 60640
Emanuel Tanay, MD*, 2977 Philadelphia Drive, Ann Arbor, MI 48103
After attending this presentation, attendees will learn the history of
Louisiana's race classification laws and their impact on people of mixed
heritage today. The presenter will draw on her tri-racial heritage in
America and her Certificate of Ancestry by DNA Print Genomics to
discuss the sensitive topic of race in America.
humanity by demonstrating evolving DNA technologies that can change
the social and legal landscape of America. However, is the legal community ready to take up the challenge?
Since this nation's inception, you have been defined as black if you
had any known African black ancestry. This became known as the "one
drop rule," meaning that a single drop of black blood makes a person
black. Some courts have referred to it as the "one black ancestor rule"
or the "traceable amount rule.” Anthropologists have designated it as the
"hypo-descent rule," meaning that racially mixed persons are assigned
the status of the subordinate group.
During the Jim Crow era, many southern states had race classification statutes. Louisiana's race classifications statute in 1970 defined
anyone as black whose ancestry is more than one thirty second black.
Sussie Phipps challenged this law in the suite filed as Jane Doe v. State
of Louisiana. Despite her blond hair and blue eyes, Ms. Phipps' birth
certificate indicated that she was "colored" which contradicted the white
classification she had checked off on her passport application. Her relatives admitted in depositions that they considered themselves colored.
In 1983, district court declared her legally black. The Louisiana State
Fourth Circuit Court of Appeals upheld the district court's decision. The
court ruled that a party could not change their racial designation or their
parents: "That Appellants might today describe themselves as white does
not prove error in a document which designates their parents as colored.
Of course, if the parents designation as ‘colored’ cannot be disturbed,
their descendants must be defined as black by the traceable amount
rule." Although noting expert testimony to the effect that the race of an
individual cannot be determined with scientific accuracy, the court said
the law of racial designation is not based on science, that "individual
race designations are purely social and cultural perceptions and the evidence conclusively proves those subjective perspectives were correctly
recorded at the time the appellant's birth certificate was recorded." At
the rehearing, the appellate court affirmed the necessity of designating
race on the birth certificate for public health, affirmative action, and that
equal protection had not been violated. The Louisiana Supreme Court in
1986 declined to review the lower courts decisions. In December of
1986, the U.S. Supreme Court dismissed the appeal for want of a substantial federal question. Consequently, the one drop rule still legally
determines who is black in America.
Today, racial classification laws are voluntary. However, race
information is still used for affirmative action and other important
programs. Science does exist now where an expert can testify to the
effect of the race of an individual based on Ancestry Informative
Markers. The question is whether the one drop rule is ripe for
reconsideration?
After attending this presentation, attendees will learn that mode of
death, unlike cause of death, cannot be determined by examining the
body of the deceased. They will gain the conviction that mode of death
determination, just like cause of death, is a subject that requires academic credentials and clinical experience.
humanity by inspiring the forensic community to establish professional
criteria for the position of medical examiner. Mrs. Yvette Sherman and
Dr. Tanay hope to increase the empathy of the forensic community for
the parents of a child who suffered untimely death as the result of his or
her own behavior.
A County executive appointed a fireman (medic) to be the interim
medical examiner for Brown County, WI. Raymond Sherman, the Green
Bay Packers coach, and his wife, Yvette Sherman, had a fourteen-yearold son, Raymond, Jr. The father found his son in the garage with a fatal
self-inflicted gunshot wound to the head. The medical examiner, Mr.
Klimek, subsequent to an autopsy, issued a press release declaring that
the youngster's death was suicide. Police investigation, forensic psychiatric reconstruction by Dr. Tanay, and the evaluation by a forensic
pathologist, concluded that it was an accident. Mr. Klimek continued to
insist to news media that it was suicide. A subsequent hearing before a
trial judge determined that mode of death was accident. Nevertheless,
Mr. Klimek issued another press release indicating that young
Raymond's death was suicide. Mr. Klimek's sixteen-year-old daughter
wrote a letter to the local paper, which was published, praising her
father's courage to resist powerful forces in his effort to uphold the truth
and professionalism. The controversy has had a great emotional impact
upon the Sherman family, particularly Mrs. Sherman, the mother.
Retrospective diagnosis of the suicidal state of mind of someone
who is deceased depends primarily upon information from those who
have known the victim. Physical evidence and autopsy results may be
consistent with suicide but are not diagnostic. Psychosocial information
is essential for the making of a diagnosis of depressive illness, which is
the underlying cause of suicide.
The gathering and interpretation of relevant psychosocial data
requires a skilled professional. Such information has to be gathered and
interpreted by professionals. Mrs. Sherman will discuss the impact this
controversy has had upon her family and the community of Green Bay.
Louisiana Race Laws, Legal Issues, Ancestry Informative
Marker (AIM)
12
Medical Examiner, Mode of Death, Suicide
BS3
Follywood — Forensic Fakes or Real Cases:
How Movies Manipulate Forensic Truth
Haskell M. Pitluck, JD*, 573 Lake Avenue, Crystal Lake, IL 60014;
Linda Kenney, JD*, 15 West 53 Street, Apartment 18 B, New York, NY
10019; James E. Starrs, LLM*, The George Washington University, 720
20th Street, NW, Washington, DC 20052
After attending this presentation, attendees will understand the foibles
of Hollywood influence on public thinking.
humanity by presenting the deluge of forensic cases as epitomized by the
movie studios to show to the audience that not only are movies are not real
life, but you can’t always believe what you see on television or in the
movies.
* Presenting Author
Having received the Oscars for the last three years, the production
team of Pitluck, Kenney, and Starrs – no guest appearances – will premiere
their new movie “Follywood: Forensic Fakes or Real Cases; How Movies
Manipulate Forensic Truth.”
This year’s breakfast will impart the audience with a deluge of
forensic cases as epitomized by the movie studios. Is Oliver Stone’s JFK
real or false? Does the “Texas Chainsaw Massacre” or “Silence of the
Lambs” capture the demented mind of Ed Gein? Is the “Ghost of
Mississippi” a tale or a truth? This presentation will also veer into a
Follywood stage set and discuss the news media. Do courtroom scenes as
commented on by news anchors depict fact or fiction? Is the news coverage of events in the Middle East truth or lies? The audience this year will
see the gamut from comedy to drama to documentary/docudrama. The
viewer will determine whether Follywood is a mockumentary or reality.
Forensics, Reality, Manipulation
BS4
Houston, We Have a Problem:
Burying Medical Examiner Mistakes
J.C. Upshaw Downs, MD*, Coastal Regional Laboratory, Georgia
Bureau of Investigation, 925A Mohawk Street, Savannah, GA 31419
After attending this presentation, attendees will understand the history
of medical examiner accreditation and certification and be familiar with the
nature of practice standards in forensic pathology.
humanity by assisting attendees to recognize danger signs of poor quality
in forensic exams, specifically regards those conducted by the medical
examiner. By developing a better understanding of the accreditation and
certification processes, practitioners will develop an enhanced appreciation
for and understanding of continued quality assurance efforts.
The public often perceives the forensic lab in general and the medical
examiner (ME) in particular as infallible. Recent high profile cases have
centered on the dangers inherent in such a false sense of confidence,
particularly in homicide cases. In any human-based system, errors are
inherent.
In the realm of the forensic pathologist, mistakes may well go
unrecognized, as the proof of error is literally buried with the body. This is
all the more tragic in that one of the arguments for establishment of a
medical examiner system is the presumed reduction of incorrect death certification by lay coroners, the system supplanted by the ME.
In this era of “evidence-based medicine,” one might reasonably ask
what standards exist in the field (a point of significant interest within the
ME community at present) to ensure that errors are detected before the
evidence is “consumed in testing.” What is the evidence that the pathologist
got the right answer? Particularly in the current period of intense public
interest in and enthusiasm for forensics as a whole, efforts to ensure
adequate funding for the crime lab and medical examiner office are endangered by low-quality exams by unqualified and/or charlatan practitioners.
Utilizing several case studies, some common and not-so-common
errors will be presented. The management dilemma in approaching recognized errors and “the problem scientist” will be addressed, specifically
regards the approach to minimizing future mistakes and maximizing good
science, to the benefit of all concerned parties.
Benefit: Attendees will understand how to recognize danger signs of
poor quality in forensic exams, specifically regards those conducted by the
medical examiner. By developing a better understanding of the accreditation and certification processes, practitioners will develop an enhanced
appreciation for and understanding of continued quality assurance efforts.
Accreditation, Certification, Errors
* Presenting Author
BS5
The Death of Sir Harry Oakes
Ronald L. Singer, MS*, Tarrant County Medical Examiner’s Office,
200 Feliks Gwozdz Place, Fort Worth, TX 76104-4919; Richard C.
Froede, MD*, 3930 N Placita de la Escarpa, Tucson, AZ 85750;
Suzanne M. Froede, MA*, 3930 North Placita de la Escarpa, Tucson,
AZ 85750
The goal of this presentation is to describe the elements of inadequate
investigation; understand the components of team investigation determine
evidence and its value; and show what inadequate investigation anc court
room preparation can do to a case.
humanity by showing what inadequate investigation and court room
preparation can do to a case.
Murdered in bed in his home in Nassau, Bahamas between midnight
and dawn on the morning of July 9, 1943, Sir Harry Oakes was 68 years
old at that time ass well as being one of the richest men in the world. His
son-in-law, Alfred de Marigny, was accused of the murder, but later
acquitted. The Duke of Windsor, who was the Royal Governor of the
Bahamas, played a part in covering up clues that would have led to the real
murderers. Harold Christie, a sometimes business partner of Oakes and the
Duke, also appeared to be involved in the murder.
Oakes was shot four times in the head and the bed set on fire. The
body was badly scorched. Incompetent and dishonest detectives from
Miami were brought in by the Duke of Windsor. de Marigny was accused
of the murder and made to stand trial. However, without any evidence the
jury could not convict him.
Alfred de Marigny did escape a sentence in the Bahamas, but was
forced to leave the islands. He had a difficult life and several attempts were
made on his life. He was eventually allowed to enter the United States and
became a citizen in 1975.
A number of books have been written about the murder: King of
Fools (1988), Who Killed Sir Harry Oakes (1983), The Life & Death of
Harry Oakes (1959), sometimes with conflicting information and interpretation. In the latest book, Alfred de Marigny has written the story of
his life: A Conspiracy of Crowns. The book was co-authored with
Mickey Herskowitz and published by Crown Publishers, Inc., in New
York, in 1990. Not only does he describe his fascinating life before
moving to the Bahamas, but also writes about the death of Sir Harry
Oakes and of suppressed evidence and silenced witnesses. The information of the FBI and other American agencies about the characters
involved add extra interest to the account.
Scotland Yard was never called in on the case and the British government has refused to reopen the case in spite of new evidence that has
surfaced.
The facts and idea will be presented using narrative and slides.
Sir Harry Oakes, Investigation, Acquittal
BS6
Bacon, Eggs, and Arsenic
Suzanne Bell, BS, MS, PhD*, Bennett Department of Chemistry, West
Virginia University, 217 Clark Hall, Morgantown, WV 26505-6045
After attending this presentation, attendees will have an understanding of one important aspect of the history of forensic science.
Arsenic has been called "inheritance powder" because of its
nefarious uses. It is an ideal poison because it can be given in incremental small doses. The symptoms, when they appear, mimic those of
infectious diseases that were rampant before the introduction of antibiotics. This is ironic given that arsenic preparations were used effectively
as anti-microbial agents for thousands of years. Ancient Egyptians and
18th century Parisians valued the pale look that only an arsenic face
cream could supply; Lewis and Clark packed along arsenic-based treat13
ments for diseases that resulted from their enthusiastic hands-on
diplomacy along their journey.
This non-technical talk will tell the story of arsenic and how it
defined early forensic science and forensic chemistry from Roman times
to the Lafarge case, the first time chemical analysis was accepted by a
court of law. This ground-breaking case was also the first time the testimony of a forensic scientist was commissioned and accepted by a
court. This case did not stop homicidal poisoning, but it did bring it to
light and demonstrated the value of everything from postmortem toxicology to quality assurance practices. It also drove poisoners to try different brews ranging from antimony and atropine to thallium and zinc.
But once the race was on, chemists and toxicologists kept pace and as a
result, poison is no longer the murder weapon of choice, having been
replaced by high velocity lead poisoning. As will be seen, arsenic still
has a devoted, if small, following. One of the most recent cases involved
a poisoned breakfast.
History of Forensic Science, Toxicology, Chemistry
BS7
Sniper: How Digital Evidence Can
Help Track and Convict the Bad Guy
Richard W. Vorder Bruegge, ScM, PhD*, Federal Bureau of Investigation,
Forensic Audio, Video and Image Analysis Unit, Engineering Research
Facility, Quantico, VA 22135; Dara Sewell, BS*, Federal Bureau of
Investigation, Computer Analysis Response Team, Engineering Research
Facility, Quantico, VA 22135; Kenneth W. Marr, BSEE, MS*, Federal
Bureau of Investigation, Forensic Audio, Video and Image Analysis Unit,
Engineering Research Facility, Quantico, VA 22135
After attending this presentation, attendees will understand how computer forensics, audio analysis, video analysis, and image analysis of digital
evidence can be applied, including precautions, safeguards, and limitations
when analyzing digital evidence
Many existing forensic disciplines employ newly developed digital
techniques to conduct forensic examinations. Therefore, this presentation
will impact the forensic community and/or humanity by providing recognition of the sources of digital evidence and describing the use of proper
safeguards when examining digital evidence are of great importance to the
forensic examiner.
Digital evidence is taking a more important role in law enforcement,
especially in high visibility criminal prosecutions and in counterterrorism.
Many existing forensic disciplines employ newly developed digital techniques to conduct forensic examinations. Digital evidence has been recognized as a forensic discipline by the American Society of Crime Laboratory
Directors, Laboratory Accreditation Board (ASCLD/LAB). Therefore,
recognition of sources of digital evidence and use of proper safeguards
when examining digital evidence are of great importance to the forensic
examiner.
This seminar describes several digital evidence examinations which
when combined can provide crucial investigative insights and compelling
criminal evidence. A fictional sniper case is presented with emphasis on
several digital evidence examinations. The investigative process can use
digital evidence results to identify links and associations that might otherwise have been overlooked; including, stolen identities, bank account
passwords, encrypted file passwords, hidden computer data, surveillance
video analysis, audio analysis of recorded background noise, and image
enhancement.
Computer forensic examiners gather and analyze evidence from a
suspect's computer hard drive and digital storage devices. Forensic
14
principles of write-protection, imaging of computer data, precautions and
limitations will be reviewed. Computer data analysis may reveal hidden or
encrypted files stored on hard drives. Detection, recovery, and analysis of
these hidden files require extensive training and experience of the CART
examiner.
Audio analysis of a suspect's recorded telephone threat and other
audio surveillance recordings, as well as digital audio files can provide significant investigative guidance. Some handheld digital recorders now
interface with computers to download files of recorded conversations that
in turn can be attached to email messages and distributed over the Internet.
Header information in the digital audio files can reveal descriptors for file
size and characteristics indicating possible hidden, embedded information
in the files.
Video and image analysis employ digital evidence techniques during
examinations of a suspect's facial comparison and height determination.
Digital surveillance systems have special limitations that must be recognized and considered. Numerous issues confront the digital evidence
examiner, including digital versus film resolution, compression, and documenting image enhancement operations. SWGIT Guidelines for acquiring,
processing, analyzing, and preserving digital images will be reviewed.
Digital evidence examinations are crucial in today's counterterrorism
society. A variety of resources exist for support when conducting digital
evidence examinations. These include the Scientific Working Group on
Digital Evidence (SWGDE) and the Scientific Working Group on Imaging
Technologies (SWGIT), which have issued guidelines for digital evidence
examiners.
Digital Evidence, Computer Forensics, Audio/Video Analysis
BS8
Tom Krauss Memorial Bite Mark Breakfast:
Forensic Witnesses and Their Vital Role in
Special Victims Prosecutions
Yolanda L. Rudich, Esq*, Sex Crimes/Special Victims Bureau, Richmond
County District Attorney, 130 Stuyvesant Place, Staten Island, NY 10301
Special victims cases are among the most difficult for a District
Attorney’s office to prosecute. Sex crimes, child abuse, domestic violence
and crimes against seniors often are committed in places that are isolated
from any witnesses. The victims are among the most vulnerable, often
presenting physical and emotional impediments to gathering the required
proof beyond a reasonable doubt.
Increasingly, prosecutions are dependent upon forensic evidence,
either as independent proof of criminal culpability or as legally necessary
corroboration of witness testimony. Moreover, the popularity of TV shows
such as “CSI” has persuaded jurors that such evidence is available and
should be presented for their consideration.
Thus, the role of the forensic witness has become critical in successful
prosecutions. If the evidence obtained by these witnesses is to be most
effectively presented within the criminal justice system, both prosecutors
and forensic experts must have a clear picture as to how such evidence
should be gathered and reported.
Additionally, as professionals esteemed beyond the laboratory, you
can embark on proactive programs in partnership with members of the
criminal justice system that will help prevent crime in your own
communities.
Forensic Witnesses, Prosecution, Special Victims
* Presenting Author
BS9
Mmmmmm....MANCHESTER (Murder,
Manslaughter, Medicolegal Machinery,
Myth, and Mayhem in Manchester,
United Kingdom)
John D. Rutherford, BSc, MB ChB, FRCP (Edin), FRCPath, DMJ*,
Salford Quays Forensic Pathology, PO Box 378, Salford, Greater
Manchester M50 3UX, United Kingdom
This study concerns the ten year period from January 1993 to
December 2002. Autopsy reports were examined for all the "suspicious"
deaths in Manchester (population approximately 2.75 million), United
Kingdom. The outcome of the medicolegal process was established by pursuing these cases through the court records system.
Approximately 1500 fatal cases fulfilled contemporary criteria of
"suspicious". Roughly one third of the cases initially deemed to be "suspicious" turned out to be the result of criminal activity and, therefore, classified as "unlawful killing" of one sort or another.
The ratio of "unlawful killings" to the total "suspicious deaths" (year
by year), the causes of death, and the ways in which the coroners and
criminal courts classified them will be outlined in the presentation.
Inconsistencies in the classification system will be highlighted, some cases
being difficult to categorize, raising the question of whether new terminology should be introduced.
Although the recorded causes of homicide are proportionally different
for the USA and the UK (mainly related to differences in availability of
firearms) the criminal justice system in both countries relies upon the
adversarial model which has intrinsic advantages and disadvantages.
However, the focus is not on a comparative international study but hinges
around potential criminal cases being missed by the British system, which
derives from a coronial structure dating back to the thirteenth century. A
classic example of such missed criminal activity was that of Dr Harold
Shipman, Britain's most prolific serial killer, who murdered in excess of
200 of his own patients before detection; there have been other, less high
profile, individual cases.
The initial classification of a death as "suspicious" or "non-suspicious" (with consequent detailed investigation or virtually no investigation)
is a crucial point at which mistakes can be made and potential criminal
cases missed. A different system might stand a better chance of picking up
otherwise undiscovered homicides.
Serious questions arise such as "who should decide what is a suspicious death?", "if the right people are not now making such decisions, then
who should?", "how do we attain consistency in the definitions of cause and
manner of death?" and "has the advent of high technology at the turn of the
21st century made any significant difference to the end result (i.e. the court
outcome) of the medicolegal process?".
In keeping with the AAFS 2005 theme, this study straddles the turn of
the century and is particularly relevant because at this meeting there is a
focus on 21st century technology to combat crime. This presentation
underlines the need for 21st century organizational thinking to run parallel
with 21st century forensic science in order to revise ways of approaching
the "Death Management System" from the first call for help from the
bereaved relative right through to the final outcome in court.
BS10 The Investigation of the Kidnapping
of Danielle van Dam: The Physical
Evidence Perspective
Jennifer Shen, San Diego Police Department Crime Laboratory,
1401 Broadway, MS 725, San Diego, CA 92101; Tanya DuLaney, BS*,
San Diego Police Department Crime Laboratory, 1401 Broadway, MS
725, San Diego, CA 92101
The goal of this presentation is to illustrate using a highly publicized trial,
the importance of evidence collection, analysis, and presentation in court. In
particular, this presentation highlights the importance of trace evidence in
establishing contact timelines between the suspect and victim in this case.
Due to the fact that the entire trial was televised we were able to, after
the fact, select important points to emphasize in our presentation and
demonstrate the types of direct and cross-examination a trace evidence
analyst can expect in a trial of this magnitude. The issues of contamination,
fiber and hair transfer, and significance of associations were addressed and
are important and relevant topics.
In the morning hours of February 2, 2002, a little girl was discovered
missing from her bed. Thus began a massive search and a herculean effort
by law enforcement agencies and citizens all over San Diego to find
Danielle and bring her home. When her neighbor, David Westerfield, was
identified as a suspect and her body was found, a series of events began to
unfold, involving the San Diego Police Department and its crime laboratory
in an investigation with time constraints and scrutiny unlike anything it had
ever experienced. Crime laboratory personnel responded to scenes at the
van Dam home, David Westerfield’s home, his motor home, his SUV, and
the body recovery site. Westerfield was interviewed and polygraphed.
Hundreds of pieces of evidence were collected, itemized, and analyzed.
Suspicious behaviors, an unreasonable alibi, child pornography, and a
failed polygraph, combined with Danielle’s blood on Westerfield’s jacket
and in his motor home, gave the police sufficient cause to arrest him for the
kidnapping and murder of Danielle van Dam.
As the preliminary hearing approached, laboratory personnel worked
feverishly to find more evidence. Latent prints located in the motor home
above the bed were identified as Danielle’s. The blood and fingerprint evidence were presented at the preliminary hearing and Westerfield was bound
over for trial. As the DA decided to seek the death penalty, the Westerfield
defense insisted on a speedy trial, giving the crime lab only a few months
to search through mountains of evidence. Danielle’s hair, her dog’s hair,
carpet fibers, and clothing fibers began to emerge from the analyses. It then
became necessary to prove that the evidence portrayed a recency of contact
between the victim and suspect, and that the evidence was not transferred
in an innocent fashion.
In the end, after thousands of man-hours, involvement by nearly every
laboratory section, and a grueling time schedule, David Westerfield was
convicted of kidnapping and murdering Danielle and was sentenced to death.
Kidnapping, Trace Evidence, Court Testimony
Death Investigation, Homicide, Technological Advance
* Presenting Author
15
BS11 On The Track of La Pérouse or the
Unknown Man of Vanikoro
Yves Schuliar, MD*, Institut de Recherche Criminelle de la Gendarmerie
Nationale, 1, Boulevard Theophile Sueur, Rosny-Sous-Bois, 93110,
France; Jean-Noel Vignal, PhD, Ircgn, 1 Boulevard Theophile Sueur,
Rosny-Sous-Bois, 93110, France
After attending this presentation, attendees will understand the role of
the forensic sciences to help to find, to examine and to identify the skeleton
of an individual who participated to a famous historical naval expedition
in 1784.
humanity by demonstrating the interest of the cooperation between
archeologists and a medico-legal team for the identification of historical
cases.
In 1784, Louis XVI, King of France, known as the “Sailor King”
decided to organise an expedition to seach for the Northwest Passage from
the Pacific side and to explore along the coasts of America, China, and
Siberia and in the South Seas. He assigned a French navy veteran of the
American War for Independence, the Comte Jean-François de Galaup de
La Pérouse to undertake the expedition.
Leading two ships, “La Boussole” and “L’astrolabe”, Jean-François
de Galaup de La Pérouse initially explored the Russian and the Japanese
coasts. Then the ships eventually left Australian shores on the 10th of
March 1788. At that time, crews did not give any sign of life. Two hundreds
sailors, scientists and officers of the King vanished.
After several years of research, both shipwrecks were found on the
VANIKORO Island. In November 2003, the Neo-Caledonian association
“Salomon” found out, during an expedition in a coral reef, many ship parts
among with an almost complete skeleton.
After specifying its discovery conditions (a film will present the
recovery expedition), authors describe the work carried out by a
multidisciplinary team which studied the skeleton. The following points are
discussed :
• anthropological study
• thaphonomical study
• osteopathological study
• post mortem delay assessment
• odontological study
• facial reconstruction
• DNA profile analysis
Hypotheses about the body’s identity are expressed, with respect to
the expedition historical data.
Submarine Archeology, Forensic Anthropology, Facial
Reconstruction
16
* Presenting Author
Luncheon Seminars
L1
Frank Davis Cooks Naturally N’Awlins
Frank Davis, WWL-TV Channel 4 Office, 1024 North Rampart Street,
New Orleans, LA 70116-2487
From the heart of the historic French Quarter, from deep in the bayou
country of southeast Louisiana, AAFS is proud to present Frank Davis, the
absolute authority on New Orleans, Cajun and Creole cooking and one of
the city’s most recognizable television chefs, cookbook authors, and
gourmets.
Born and raised in the heart of the Crescent City, Frank Davis began
cooking New Orleans food at eight years old and hasn’t stopped since.
Working with a number of notable chefs, Frank developed a unique
culinary style of his own that can only be described as “Strictly N’Awlins.”
In 1976, Frank Davis brought the Strictly N’Awlins style to WWL
Radio for its first “live” two-hour-call-in cooking show. After five years on
the air, he moved from radio to WWL TV and began airing “In The Kitchen
with Frank Davis” in the two-hour morning news show. It’s still attracting
an immeasurable morning audience and pulling unbelievable rating points.
Frank wrote his first cookbook, “The Frank Davis Seafood
Notebook,” in 1983. His second one, “Frank Davis Cooks Naturally
N’Awlins,” came along in 1990. They both achieved “best-seller” status
rapidly. His latest creation is “Frank Davis Cooks Cajun, Creole, and
Crescent City.” It, too, is selling like the proverbial hotcakes all over the
country! He is presently working on his next book, “Frank Davis Cooks
N’Awlins Homestyle.” Plans are to have it ready sometime later this year.
Cooking, Frank Davis
L3
Justice From Both Sides of the
Courtroom: From Homicide Detective
to Criminal Defense Attorney
Karen F. Ross, MD, Jefferson Parish Forensic Center, Harvey, LA
70058; Edward J. Rantz, JD*, Rantz and Associates, 1515 Poydras Street,
New Orleans, LA 70112`; Karen F. Ross, MD*, Jefferson Parish Forensic
Center, 2018 8th Street, Harvey, LA 70058; and Eric J. Hessler, JD*, 201
South Galvez Street, New Orleans, LA 70119
The pursuit of justice is a driving force in the lives of many in the
various disciplines of forensic science. After attending this presentation,
attendees will be introduced to two former homicide detectives for the New
Orleans Police Department now attorneys whose practice includes criminal
defense.
humanity by demonstrating the importance of the pursuit of justice from
both the prosecution and defense viewpoints.
These men have had the unique opportunity to participate in the
criminal justice system on part of both the prosecution and the defense.
They will relate their experiences as key fact witnesses for the state
including some highly publicized cases such as that of a NOPD officer who
was convicted of murdering a fellow officer and was sentenced to die. Both
have also been involved in fatal shootings where they were forced to take
the life of another person, so they may explain first hand what it is like to
endure the scrutiny of criminal justice from that point as well.
As criminal defense attorneys they continue to pursue justice, but
from the other side of the courtroom, maintaining the position that all are
entitled to an adequate defense and a trial before their peers as the system
intends.
Justice, Criminal Defense Attorney, Homicide Detective
L2
What’s on the Menu
Jason H. Byrd, PhD*, Office of the Medical Examiner, 1360 Indian Lake
Road, Daytona Beach, FL 32124
After attending this presentation, attendees will gain an understanding
of the Defect Action Levels allowed for food items.
humanity by providing the realization that insects are a common part of a
well-balanced meal.
Many societies have a social stigma against consuming insects as a
food source. Our modern society may top the list of cultures having an
aversion to “entomophagy”, the act of utilizing insects as food. However,
our diet is more varied than we may imagine, and most of us unknowingly
consume insects on a daily basis, as insects are a routine portion of our diet.
Unfortunately, becoming aware of this simple fact may not allow you to
avoid the inevitable. The United States Food and Drug Administration
Center for Food Safety and Applied Nutrition establishes the maximum
levels of natural or unavoidable defects in foods for human use that present
no health hazard. Commercially processed egg, meat, and poultry products
are regulated by the United States Department of Agriculture’s Food Safety
and Inspection Service. Contaminants of fruits, vegetables, and other
plants are regulated by the USDA’s Animal and Plant Health Inspection
Service. Such levels are set because it is “economically impractical to
grow, harvest, or process raw products that are totally free of non-hazardous, naturally occurring, or unavoidable defects”. This presentation
focuses on the insect particulate matter present in the food we eat.
Insects, Food, Defects
* Presenting Author
17
Workshops & Workshorts
W1
There is “Gold” in Mold: Forensic
Evaluation and Litigation Issues in
Mold and Indoor Air Pollutant Claims
Mohan Nair, MD*, 5212 Katella, Suite 106, Los Alamitos, CA 90720;
Robert Weinstock, MD*, 10966 Rochester Avenue, #4C, Los Angeles, CA
90024; Ajit S. Arora, MD, PhD*, UCLA, 8660 Woodley Avenue, North
Hills, CA 91343; Ashok Jain, MD, MPH*, USC Medical School, 237 St.
Albans, South Pasadena, CA 91030; and David Gyepes, JD, PhD*, 1990
South Bundy Drive, Suite 320, Los Angeles, CA 90025
After attending this presentation, participants will learn about the
growing “toxic mold industry.” They will learn how to evaluate from
medical, toxicologic and neuropsychiatric aspects of toxic mold claims.
The connection between claims of mold related illness to other forms of
abnormal illness behavior, and syndromes such as multiple chemical
sensitivity, sick building /new building, fibromyalgia and chronic fatigue
will be addressed.
Mold spores are present in all indoor and outdoor environments and
cannot be eliminated. Of more than 50,000 species of fungi, only about
150 are known to be human pathogens. While mold mycotoxins can cause
mucosal irritation, there is no clear evidence of chronic, nonmucosal
pathology in human beings, even in water-damaged buildings. Mold
related litigation is described as “the next big thing” after asbestos.
Between 1999 and 2001, there has been a thousand-fold increase in
toxic mold-related insurance claims. A query on Google showed 114,000
hits for the term “Toxic Mold Neuropsychiatric.” These key words
showed zero hits on Psych info and Medline.
A third of the 600 million dollar homeowner claims paid out by
Farmers Insurance in the state of Texas over the past two years was mold
related. California became the first state in the nation to legislate moldrelated regulations, i.e., the Toxic Mold Protection Act, SB732, 2001. The
magnitude of payouts have led to major insurance companies excluding
coverage for mold related damage
Though sometimes serious, physical illness in toxic mold claims is
often of short duration. Attorneys and doctors with high profile toxic mold
practices often emphasize n.europsychi.atric claims of disability and
suffering from physical problems. This is especially true when there are a
few robust findings on laboratory and physical examination. Allegations
of brain damage are made on the basis of nonreplicable anecdotal and
idiosyncratic interpretation of technologies, such as SPECT, PET and
neuropsychological testing that often do not meet Daubert Standards.
Body fluids are often sent for expensive and obscure tests. Findings of
illness and disability may not be substantiated by face-to-face examination, the patient’s account of day-to-day functioning, on independent
psychological testing, as well as by reviewing prior medical records and
depositions. There is often evidence of pre-existing and concurrent
factors, unrelated to the mold exposure in these individuals. Dr. Arora will
cover key points in the medical examination. Dr Jain will discuss the toxicology of mold mycotoxins and factors in the physical and laboratory
examination.
Dr. Nair will present the steps in the psychological/psychiatric
examination, and review of records Controversies in psychological/neuropsychological testing and neuroimaging findings will be discussed.
Attorneys, toxicologists, occupational environmental medicine and
mental health professionals who conduct Independent Medical and
Psychiatric Examinations will benefit from this workshop.
Mold, Indoor Air Pollutants
18
W2
Forensic Bone Histology
Helen Cho, PhD*, Davidson College, PO Box 6934, Davidson, NC
28035-6934; Robert R. Paine, PhD*, Texas Tech University, Department
of Sociology, Anthropology, and Social Work, Lubbock, TX 79409;
Douglas H. Ubelaker, PhD*, and Dawn M. Mulhern, PhD*, National
Museum of Natural History, Smithsonian Institution, Department of
Anthropology, Washington, DC 20560; and Samuel D. Stout, PhD*, Ohio
State University, Department of Anthropology, 124 West 17th Avenue, 244
Lord Hall, Columbus, OH 43210-1364
Upon completion of this workshop. the participant should have a
better understanding of various applications of quantitative and qualitative
histology of human skeletal tissue to aid in the identification of the
unknown individuals.
Much can be gleaned from skeletonized human remains, even if they
are extremely fragmentary. This presentation will impact the forensic
community and/or humanity by demonstrating how standard osteological
methodologies coupled with specialized techniques. such as bone
histology, can improve the likelihood that unknown skeletal remains will be
identified.
Histology, Bone, Microstructure
W3
Educating Forensic Scientists for the 21st
Century: Instilling the Forensic Mindset
Suzanne Bell, PhD*, West Virginia University, Bennett Department of
Chemistry, 217 Clark Hall, Morgantown, WV 26506-6045; Richard E.
Tontarski, PhD*, ATF, Fire Research Laboratory, 6000 Ammendal Road,
Beltsville, MD 20705; Sherry Brown, MS*, York College of Pennsylvania,
Physical Sciences Department, York, PA 17405-7199; Aaron L.
Brudenelle, BA, MS*, Tucson Police Department Crime Laboratory, 270
South Stone, Tucson, AZ 85701; Robert E. Gaensslen, PhD*, University
of Illinois at Chicago, Forensic Science (M/C/866) College of Pharmacy,
833 South Wood Street, Chicago, IL 60612; Max M. Houck, MA*,
Forensic Science Initiative, West Virginia University, 999 Chestnut Ridge
Road, Morgantown, WV 26506; Linda A. Lewis, PhD*, Oak Ridge
National Laboratory, 113 C Union Valley Road, Oak Ridge, TN 37830;
Keith Morris, PhD*, c/o Suzanne Bell, PhD, West Virginia University,
Bennett Department of Chemistry, 217 Clark Hall, Morganton, WV
26506-6045; Heather J. Schafstall, MS*, Oklahoma State Bureau of
Investigation, 2132 NE 36th Street, Oklahoma City, OK 73111; Susan
Scholl, MS*, New Mexico Department of Public Safety, PO Box 1628,
Santa Fe, NM 87504-1628; and Kelli Sikorski*, c/o Suzanne Bell, West
Virginia University, Chemistry/Forensic Science, 217 West Clark Hall,
Morgantown, WV 26506-6045
The goal of this presentation is to assist attendees to design courses
and course activities that serve the needs of students and the profession;
understand the need for and foster the development, academic rigor, and
acceptance; and define and understand the forensic mindset and use it to
guide course and curriculum development.
humanity by assisting forensic educators in designing courses and curricula
to meet the unique needs of forensic sciences as a career. It will also foster
efforts to increase the academic rigor of forensic science with an emphasis
on forensic chemistry. It will also provide a forum for practitioners and
educators to discussion joint interest and opportunities.
* Presenting Author
The Technical Working Group on Education (TWGED) and the
Forensic Science Education Programs Accreditation Committee (FEPAC)
has done a laudable job of specifying the curricular requirements of a
forensic science program. With the framework in place, attention is turning
to execution. Educators, many of whom have not worked in the field, need
guidance from the profession to flesh out the framework with meaningful
courses, lectures, labs, and practicums. This need is particularly pressing in
upper division and graduate-level courses where such materials are scarce
to non-existent. However, with a need comes many opportunities.
New analysts should leave university with a skill set unique to
forensic science. This includes the ability to present meaningful testimony
and reaching beyond the borders of their specialities. Instilling these skills,
collectively the forensic mindset, is a challenge that forensic educators
must rise to. This workshop will assist in this by defining and discussing
the elements of the forensic mindset and offering practical ideas and
suggestions for developing it in students. The primary goal of this
workshop is to assist educators in fleshing out the framework of their programs and courses. Presenters will discuss and define the elements of the
forensic mindset and offer practical guidance and suggestions for how to
instill it within the context of an academic program.
A second goal of the workshop is to discuss the need for academic
acceptance of forensic science. Those who have crossed the great divide
from forensic labs into the academic world are under pressure to increase
the rigor of forensic science, particularly when it is incorporated into
traditional disciplines and departments such as chemistry and biology.
Many such departments regard forensic science/forensic chemistry/
forensic biology as little more that “blood spatter and crime scenes,” a misconception fueled by popular television shows and the flood of students
generated. Overcoming this stereotype is vital for the field and can open
new opportunities for research, funding, and collaboration. Courses need to
be designed with this in mind. Conversely, successful courses and applications can capitalize on student interest and foster appreciation of science
regardless of the student’s major or career plans.
The morning session will present overviews and ideas from the
perspective of students, educators, supervisors, and practitioners. The
afternoon will delve into the nuts and bolts of course design, focusing on
upper division courses. The discussions and applications have a chemistry
flavor but the overriding principles and themes are broadly applicable.
The target audience for this workshop are educators involved in or
contemplating the launch of a forensic science program. Forensic supervisors,practitioners, and students with an interest in forensic education will
also find much material of interest.
Forensic Education, Professional Training, Continuing Education
humanity by serving to provide a foundation for forensic toxicologists and
other interested parties so they may understand how and why agents can be
toxic. It will marry the knowledge and observations of forensic pathologists
with those of forensic toxicologists to aid in accurate Medical Examiner
conclusions for cause and manner of death.
Forensic Scientists evolve from a plethora of educational backgrounds
that have not always provided a complete foundation for understanding the
mechanism of toxicity by first comprehending how the body functions.
This workshop can serve as a review, an introduction, or a continuing
educational experience by offering an overview of anatomy, physiology,
and pathology and an explanation of how each of these scientific fields are
relevant to the basic knowledge of toxicity.
The workshop will begin with a general description of anatomy. The
speaker will highlight each of our body’s systems at the gross and cellular
level. One-by-one anatomical systems such as the nervous, cardiovascular,
musculoskeletal, gastrointestinal, respiratory, hepatic, renal, endocrine, and
reproductive will be discussed. Once the body’s anatomical depiction is
complete, the discussion will progress to the next topic of how toxins affect
each of these systems.
A forensic pathologist will explain how toxins adversely affect the
body on a physiological and pharmacological level. Mechanisms of
toxicity for specific anatomical regions will be discussed in detail including
signs and symptoms, pathological findings, and pharmacological causes.
For example, answers to questions such as: What exactly is pulmonary and
cerebral edema and what causes them to occur when a CNS depressant is
ingested in excess? What other pathological findings would be expected in
cases involving pulmonary and cerebral edema? What other causes of death
are consistent with these pathological findings and must be disproved
before a pathologist rules the death toxicologically related? will be
discussed.
To further illustrate how toxins act on the body, specific agents will be
discussed to explain how and why they kill or lead to serious and long-term
injury. Considerations such as the route of administration, dosing history
(e.g., acute vs. chronic, tolerance vs. non-tolerance) and drug-drug interactions all contribute to how and why a drug kills in one instance or individual
but not another. These considerations are easier to explain once the
foundations of anatomy, physiology, and pathology have been established.
Finally, the panel of speakers will reconvene to address questions and
further discuss topics of interest with the audience. At the conclusion of this
workshop, the attendee will have a better understanding of how the body
functions anatomically and physiologically, in addition to understanding
how toxins act on and adversely effect the body.
Anatomy of Toxicity, Physiology of Toxicity, Pathology of Toxicity
W4
Anatomical, Pathological, and
Physiological Foundations of Toxicity
Diana Garside, PhD*, North Carolina Office of the Chief Medical
Examiner, 1001 Brinkhous Bullitt Building CB#7580, Chapel Hills, NC
27599; Jeri Ropero-Miller, PhD*, North Carolina Office of the Chief
Medical Examiner, 1001 Brinkhous Bullitt Building CB#7580, Chapel
Hills, NC 27599; Michael J. Caplan, MD*, Department of Pathology and
Laboratory Medicine, Division of Autopsy and Forensic Pathology,
Medical University of South Carolina, Department of Pathology and
Laboratory Medicine, 165 Ashley Avenue, Charleston, SC 29425;
Alphonse Poklis, PhD*, Departments of Pathology, Pharmacology,
Toxicology, Chemistry/Forensic Science, Virginia Commonwealth
University, Medical College of Virginia, MCV Station Box 165, Richland,
VA 23298; and Kenneth S. Snell, MD*, Mecklenburg County Medical
Examiner’s Office, 618 North College Street, Charlotte, NC 28202
The goal of this presentation is to describe the anatomical systems of
the body and how each functions; provide understanding of how toxins
adversely affect the body and each of its anatomical systems; and discuss
the common mechanisms, sign and symptoms, pathological findings, and
actions of a toxin when it enters the body.
* Presenting Author
W5
Forensic Digital Evidence: Current and
Prospective Scientific and Legal Issues
Anjali R. Swienton, MFS, JD*, SciLawForensics, Ltd., 25 Walnutwood
Court, Germantown, MD 20874; Gregory L. Hill, JD*, PO Box 451568,
Kissimmee, FL 34745-1568; Susan W. Brenner, JD*, University of
Dayton School of Law, Juseph E. Keller Hall, Room 421, Dayton, OH
45469-2772; Erin E. Keanneally, JD, MFS*, University of California,
San Diego, San Diego Supercomputer Center, 9500 Gilman Drive,
LaJolla, CA 92093-0505; Michael J. Menz, BS*, Hewlett Packard &
Sacramento High Technology Crimes Task Force, 4510 Orange Grove
Avenue, Sacramento, CA 95841; Fred C. Smith, JD*, Assistant United
States Attorney, Federal Office Building, PO Box 607, Alburquerque, NM
87102; Michael C. Weil, MBA*, Huron Consulting Group, 550 West Van
Buren, Chicago, IL 60607
After attending this presentation, attendees will have a basic
understanding of some digital evidence investigatory strategies and
examination procedures as well as evidence admissibility issues related to
digital evidence
19
humanity by opening discourse within the forensic community on timely
issues related to accreditation of digital evidence laboratories, validation
of examination techniques and trial strategies for trials involving various
types of digital evidence.
Currently, forensic digital evidence is anything but a science and is
primarily an art, with few accepted techniques, standards of competence
and performance and published data as to validity and reliability of
results.
Despite the increase in commercially available digital forensic tools
and techniques, its introduction and use in the courtroom in criminal
cases is largely limited to computer child pornography and Internet
stalking cases. Digital forensic evidence is beginning to be introduced
into the courtroom in murder, fraud, extortion, securities, and espionage
cases. Meanwhile, digital forensics are employed in nearly every major
white collar investigation and many aspects of complex civil litigation.
A common theme that will begin to evolve as more and more cases
are litigated, regardless of whether the case is criminal or civil, will be
the attempt to develop accepted standards of reliability and validity to
avoid Daubert challenges to digital evidence as a required routine in
nearly every case.
Challenges regarding the technology, ability of technological tools
to access and recover such “evidence”, limitations or deficiencies in
such tools to access and recover “evidence”, qualifications of the individual utilizing the tools and the ability of lay and expert witnesses to
testify and effectively communicate in court about all of these matters
will continue for the foreseeable future.
Various interested sectors, including the network security application industry, have developed their particular niches and parameters
for use of forensic tools and techniques. Digital forensics is beginning to
be recognized as an area ripe for investigation and research.
The workshop will place the rapidly changing and abstract landscape of litigation involving digital forensic evidence, into a more comprehensible and realistic picture and will be presented in four segments.
The first segment will provide the attendee with an introduction to
the field of forensic digital evidence, general terminology, widely used
and tested tools, techniques, and their known limitations for the production and analysis of admissible forensic evidence.
The second segment will be presented in the format of a criminal
trial which will deal with several frequently encountered aspects of the
problem of presenting admissible forensic digital evidence in the
courtroom. Case facts derived from an actual case will be customized,
with checklists and actual decision summaries to bring to life the concrete past examples and also provide guidance for handling future
problems.
A third segment will include a panelist discussion to assess the
current status and prospective issues in forensic digital evidence. The
panel includes: a prosecutor, a defense attorney, an academic legal
scholar, a technical expert, an investigator, and an examiner. Each panelist will address certain issues relative to their area of expertise.
Finally, a group discussion, with the attendees participating and
presenting their own problems in advance to the panel for discussion and
feedback will close out the session.
At the conclusion of the workshop the participants should possess
a basic understanding of the current status of forensic digital evidence
and the scientific and legal issues that have been litigated to date.
Through the panel presentations and group discussion, the forensic
science community should be able to further explore the development of
digital evidence to enhance its usage and reliability in the courtroom.
W6
Serial Homicide, Myths, Legends and Facts
Robert J. Morton, MS*, FBI NCAVC, FBI Academy, Quantico, VA
22135; James J. McNamara, MS*, FBI NCAVC, FBI Academy,
Quantico, VA 22135; Mary Collins-Morton, BS*, FBI Washington
Field Office, 601 4th Street, Northwest, Washington, DC 20535; and
Gerard F. Downes, BS*, SSA - FBI NCAVC, FBI Academy, Quantico,
VA 22135
The purpose of this workshop is provide investigators and medicolegal professionals with an understanding of serial murderers, their
motives, methods of operation, victim selection, and body disposal
scenarios highlighted through case examples. The focus of the
workshop is on the practical issues involved in investigating and analyzing the actions of a serial murderer, the benefits of input from different disciplines and the need for cooperation between professionals.
humanity by providing participants a greater understanding of the
“truth” about serial homicide, to include, the scope of serial murder,
serial offenders and motivation, methods of operation, victim selection,
body disposal, forensic techniques and collection strategies pertinent to
serial homicide, and cooperative investigative strategies useful to
successful case resolution.
This workshop is targeted at providing investigators and medicolegal practitioners with a broad base of knowledge concerning serial
murder, as well as a thorough understanding of the nature of serial
offenders. Workshop will include a discussion of serial murder and it’s
parameters, motivations of serial offenders, forensic issues and
investigative issues. Workshop discussions will be augmented by
numerous case examples, including several “high profile” cases.
Serial homicide has long been an issue that generates much
attention, from law enforcement, mental health practitioners, medicolegal professionals, and the media. There are a plethora of opinions.
Law enforcement regard serial homicide as a painful anomaly, mental
health practitioners look for causes, medico-legal professionals struggle
with the results and the media inflates serial homicide into an epidemic.
It’s no surprise that many myths and legends abound concerning serial
killers.
The FBI’s National Center for the Analysis of Violent Crime
(NCAVC) is routinely consulted by federal, state and local authorities in
a variety of cases of violent crimes, especially bizarre or serial homicides. The NCAVC has had extensive experience in assisting federal,
state, and local law enforcement agencies in the investigation of serial
homicides, and has reviewed hundreds of serial homicide cases for
research purposes. Currently, the NCAVC is engaged in several research
projects on serial offenders, including interviews of incarcerated serial
offenders. The material presented in this workshop is based upon actual
case experience, ongoing research, and current interviews with serial
offenders.
Serial Homicide, Serial Murderer, Victimology
Digital Evidence, Technical Expert Testimony, Criminal Trial
20
* Presenting Author
W7
Tutorial and Panel on Engineering
Evidence and Lay Testimony
Richard W. McLay, PhD, PE*, University of Iowa, 1231 Hamilton Court,
Iowa City, IA 52245; Robert N. Anderson, PhD, PE*, RNA Consulting,
Inc., 27820 Saddle Court, Los Altos Hills, CA 94022; Donald J.
Anderson, BS*, Anderson Engineers, 13176 Pierce Street, Blain, MN
55434; Joe S. Cecil, PhD, JD*, Division of Research, Federal Judicial
Center, One Columbus Circle, NE, Washington, DC 20002-8002; Laura
L. Liptai, PhD*, Biomedical Forensics, 1660 School Street, Suite 103,
Moraga, CA 94556; Joseph J. Maltese, JD, MJS*, New York Supreme
Court, Home Port Court House, 355 Front Street, Staten Island, NY
10304; Andre A. Moenssens, JD, LLM*, The University of Missouri,
1760 East Poplar Road, Columbia City, IN 46725; Donn N.
Peterson, MSME, PE*, Peterson Engineering, PO Box 47565, Plymouth,
MN 55447-0565; David V. Scott, JD*, Scott, Forrest, and Bourne,
PO Box 785, New Albany, IN 47151-0785; Thomas J. Vesper, JD*,
Westmoreland, Vesper, Schwartz, and Quattrone, Bayport One, Suite 500,
8025 Black Horse Pike, West Atlantic City, NJ 08232; and Timothy W.
Waldeck, JD*, Waldeck & Lind Law Firm, 1400 TCF Tower, 121 South
8th Street, Minneapolis, MN 55402
After attending this presentation, attendees will understand the three
forms of engineering evidence and be able to evaluate lay engineering
testimony and opinions.
humanity by demonstrating how a major problem with engineering
testimony has been that laymen without proper training, using improper
scientific methods, have been allowed to give engineering opinions in both
criminal and civil cases. With the 1993 U.S. Supreme Court Decision on
Daubert and the companion decision on Kumho Tire vs. Carmichael,
methods have become available to challenge laymen giving questionable
engineering testimony. The impact on our society and on humanity in
general for this workshop will be to propose methods of fairness in
evidence.
This program, in two parts, presents: tutorials on engineering methods
for use in accident reconstruction and a panel on lay engineering testimony.
The tutorials are on technical content and precedents in the law:
• Engineering fundamentals are presented for momentum and energy.
• Biomechanics principles for accident reconstruction are illustrated.
• Mapping in engineering analysis is shown to be crucial for records.
• Simulation in vehicle impact and non-contact motion is presented.
• Failure analysis of vehicle components is shown to be a factor in
analysis.
• Deposition methods for inquiring of lay engineering testimony are
shown.
• Daubert challenges are presented for engineering evidence.
• Precedents in engineering evidence are presented.
The panel discussion will focus on lay engineering testimony and the
methods to be used to ensure that the evidence is good science and engineering. The speakers will be joined by the author of the amicus curiae
brief for engineers, submitted to the U.S. Supreme Court in Kumho Tire vs.
Carmichael; a Justice of the New York Supreme Court; and the Director
of The Evidence Project at the Federal Judicial Center.
A CD-ROM handout will include abstracts of the presentations.
Engineering Evidence, Engineering Methods, Lay Testimony
W8
Practical Homicide Investigation: Tactics,
Procedures and Forensic Techniques
Vernon J. Geberth, MS, MPS*, P.H.I. Investigative Consultants, Inc.,
PO Box 197, Garnerville, NY 10923; and Robert D. Keppel, PhD*,
Sam Houston State University, Box 2296, Huntsville, TX 77341-2296
Upon completion of this workshop, the participants will have an
understanding of the practice and theory of professional homicide investigation; they should better understand pertinent legal decisions, multiple
crime scenes, components of a murder investigation, how time and distance
as solvability factors affect murder cases, the management of the homicide
investigations and the processing of the homicide crime scene.
The instructors for this workshop have many years of homicide investigation experience. Currently, they both teach law enforcement officers
from around the country about practical homicide investigation. At the
Academy of Forensic Sciences, that same information can be passed on the
forensic scientists from all disciplines. This presentation will impact the
forensic community and/or humanity by providing forensic scientists with
an understanding of the most modern techniques and procedures homicide
investigators utilize to solve murder cases.
Specifically, Commander Geberth will cover the practice and theories
of professional homicide investigation involving equivocal death investigation, the homicide crime scene, the general and specific duties of the first
officer, and duties at the crime scene for detectives.
Dr. Keppel will focus on the empirical research on solvability factors
in murder investigations. His presentation will show that the more information on the times and distances separating where the victim was last
seen, the locations of the original contact between the victim and the killer,
where the initial assault occurred, the murder site and the body site the
more likely a murder case will be solved.
The workshop also informs participants about managing the homicide
case and the homicide crime scene process. This will include the use of
blood enhancement reagents, the recognition and management of wound
structures in shootings, stabbings, blunt force injuries and deaths by
asphyxiation.
The workshop concludes with a “who-done-it” and “who-is-it” rapemurder case presentation in which the victim was found in a wooded area
with no identification and no immediate evidence leading to the killer. The
participant will be taken through the entire investigative process from the
finding of the body to the arrest of the suspect, using information about the
site locations and the evidence at each site to identify the suspect and
connect the suspect to the victim and, ultimately, resolve the case.
Homicide, Murder, Solvability
W9
Analysis of Samples From Clandestine
Methamphetamine Laboratories
Sanford A. Angelos, MSc, MEd*, and Camala L. Dubach, BSc*, U.S.
Drug Enforcement Administration, 536 South Clark Street, Room 800,
Chicago, IL 60605; David W. Love, BS*, U.S. Drug Enforcement
Administration, South Central Laboratory, 10150 East Technology
Boulevard, Dallas, TX 75220-4377; Nelson Santos, BA, MPA*, U.S. Drug
Enforcement Administration, North Central Laboratory, 536 South Clark
Street, Chicago, IL 60605, and Harry F. Skinner, MS*, U.S. Drug
Enforcement Administration, Southwest Laboratory, 2815 Scott Street,
Vista, CA 92081
The goal of this presentation is to present an overview of the predominant concerns surrounding the analysis of samples from clandestine
methamphetamine laboratories. The attendees will receive information on
the legal background and current status of methamphetamine as well as
court testimony and production capacities of clandestine laboratories. This
workshop will provide general information on current clandestine
laboratory synthesis methods and specific protocols for the sampling and
* Presenting Author
21
analysis of clandestine laboratory exhibits. Various reaction by-products
and commonly identified adulterants found in samples and their
significance will also be discussed.
humanity by demonstrating the ease of clandestinely manufacturing
methamphetamine and the similarities in the varieties of chemical
syntheses procedures, recognition and positive identification of the
manufacturing process can present challenges.
Currently, there are three major synthetic methods commonly used to
convert ephedrine or pseudoephedrine to methamphetamine. The first is the
hydriodic acid (HI) and red phosphorus (red P) method; the second is the
iodine (I2) and red phosphorus method commonly referred to as the ‘Cold
Cook’; and the third is the anhydrous ammonia (NH3) and either sodium
(Na) or lithium (Li) metal method, known as the ‘Birch Reduction’ method.
These methods have a regional character and can vary dramatically in production scale. All of these procedures require either ephedrine or pseudoephedrine as the precursor. Additionally, each of the procedures can
have several variations. Given the ease of clandestinely manufacturing
methamphetamine, and the similarities in the varieties of chemical
synthesis procedures, recognition and positive identification of the
manufacturing process can present challenges to forensic chemists and law
enforcement personnel.
The forensic chemist has two areas of concern in the analysis of
clandestine methamphetamine laboratory samples. The first is the
determination that there is a clandestine laboratory and that the material
manufactured is in fact a controlled substance. The forensic chemist must
be able to identify the synthesis procedure and the variations made by the
operators. This requires a more systematic analytical approach. The
second consideration is that the prosecution will usually require the
forensic chemist to provide information that the site was a clandestine laboratory, and the clandestine laboratory’s production capability, especially if
a substantial amount of a listed precursor is involved. Coupling the various
complex and confusing legal aspects with the analytical difficulties,
clandestine laboratory samples present the forensic chemist with significant
challenges.
The workshop will provide information to address the challenges
stated above. An overview of the three current syntheses used to convert
ephedrine or pseudoephedrine to methamphetamine encountered in
clandestine laboratories will be provided. Various reaction by-products and
commonly identified adulterants found in samples and their significance
will also be discussed. In addition, the workshop will show how samples
are identified to be submitted as exhibits and the procedures for taking
samples at clandestine laboratories. Analysis protocols for liquids, both
aqueous and organic, as well as solid samples, will be presented. Actual
data will be provided.
Clandestine Laboratories, Sample Analysis, Methamphetamine
Synthesis
W10
NITECRIME: Workshop on Trace
Elements and Isotopes in Forensic Science
Jose R. Almirall, PhD*, Department of Chemistry, International Forensic
Research Institute, Florida International University, Miami, FL 33199;
JoAnn Buscaglia, PhD*, FBI Laboratory, CITFSRU, FBI Academy,
Quantico, VA 22135; Jim Ehrlinger, PhD*, University of Utah, Biology,
ASB, Department of Biology, 257 South 1400 East, Salt Lake City, UT
84112; Jurian A. Hoogewerff, PhD*, Institute of Food Research, Norwich
Research Park, Colney, Norwich, NR4 7UA, United Kingdom; Robert D.
Koons, PhD*, FBI Laboratory, CTFSRU, FBI Academy, Quantico, VA
22135; Christopher Latkoczy, PhD*, ETH Zurich, Lab of Inorganic
Chemistry, HCI G111, Wolfgang-Pauli-Strasse 10, Zurich, 8093,
Switzerland; Shirly Montero, PhD*, NFI, Netherlands Forensic Institute,
Volmerlaan 17, Rijswijk, 2288 GD, The Netherlands; Ken Pye, PhD*,
Prof. Kenneth Psy Associates, Ltd., Crowthorne Enterprise Centre,
Crowthorne Business Estate, Old Wokingham Road, Crowthorne, RG45
6AW Berkshire, United Kingdom; and John Watling, PhD*, Curtin
University of Technology, School of Chemistry, GPO Box U1987, Perth,
6845, Western Australia
After attending this presentation, attendees will understand the basic
principles of trace elemental and isotopic analysis, become aware of how
these methods can be applied to forensic science and learn how to access
these methods for their own work.
humanity by providing a better understanding of the application of these
sophisticated methods to evidence analyses. Workshop participants will be
exposed to a number of techniques and methods that can be immediately
applied to improve the value of scientific evidence.
The requirement to characterize and compare physical evidence from
crime scenes, fraud and environmental casework is a major task in forensic
science. Trace element and natural isotope profiles can assist in this
process. New developments in instrumentation have created exciting possibilities for the routine “non-destructive” isotope and trace-element
analysis of small and valuable specimens. Specialists from the NITECRIME Network (www.nitecrime.eu.com) will give an introduction on
how to use trace elements and natural isotopic profiles to verify the authenticity and/or origin of raw materials, industrial products and materials,
illegal drugs, foodstuffs, and human remains. Special attention will be
given to the origin of trace element and isotopic variations in nature, the pro
and cons of analytical systems and data presentation and interpretation.
NITECRIME is an acronym for “Natural Isotopes and Trace Elements
in CRIMinalistics and Environmental forensics”. It is an EU funded global
network for developing and validating state of the art analytical methods
and for disseminating these methods and practices to relevant users.
Member organisations consist of forensic laboratories (FSS, FBI, BKA,
NFI, US Customs and others) and academic institutions (Inst. of Food
Research, Florida International University, ETHZ, Curtin Univ., Utah
Univ., Otago Univ. and others) from around the world. (See also
www.nitecrime.eu.com).
The methods developed in the network are used to identify characteristic inorganic fingerprints not only from classical forensic materials like
glass and bullets but also from food products, precious metals and human
remains. Additionally the network is developing guidelines on how to
interpret the multivariate data and how to present the results to a legal
audience.
Elemental Analysis, Isotope Ratio Analysis, Multi-Variante Data
Analysis
22
* Presenting Author
W11
Forensic Image and Video Processing
Zeno J. Geradts, PhD*, Netherlands Forensic Institute, Laan van
Ypenburg 6, Den Haag, 2497 GB, Netherlands; Richard W. Vorder
Bruegge, PhD*, FBI Academy, Building 27985A, Quantico, VA 22135;
Jurrien Bijhold, PhD*, Netherlands Forensic Institute, Volmeran 17,
Rijswijk, 22884D, Netherlands; Bart Hoogeboom, MSc*, Netherlands
Forensic Institute, Volmeran 17, Rijswijk, 2288, Netherlands; William
R. Oliver, MD*, Georgia Bureau of Investigation, 533 Underwood
Drive, Trion, GA 30753; Lenny Rudin, PhD*, Cognitech, 225 South
Lake Avenue, Suite 601, Pasadena, CA 91101-3010; Carrie M.
Whitcomb, MSFS*, National Center for Forensic Science, c/o University
of Central Florida, PO Box 162367, Orlando, FL 32816-2367
After attending this presentation, attendees will undertand the
possibilities are with digital images and video streams, and which
techniques can be used in forensic science. Learn how quality assurance
principles are applied to AV.
During this workshop information will be provided on new developments of forensic investigation of (digital) images and video streams and
the use of 3-dimensional computer modelling in forensic investigations.
Traditional sources of images as evidence concern crime scene
photography, and more specifically, photographs of fingerprints, tool
marks, shoe prints and other impressions. A short overview of image
processing techniques is given. Special attention is given to the introduction
of artefacts by image processing (e.g. FFT on fingerprints).
During the last 25 years the use of CCTV-camera systems has become
widespread. Typical questions concern the quality and the selection of
images from a specific camera in a multi-camera-recording. Digital processing of video streams for presentation and storage purposes, and the
compression techniques that are applied in digital CCTV-systems, lead to
questions about the integrity and authenticity of recordings. Also questions
about image interpretation like facial recognition, body length, or car speed,
often in low resolution, time lapse, or compressed images have increased.
New sources of video streams and images are video recordings from
handy cams, digital photo camera’s, internet and cellular phones. Typical
questions about these recordings concern the integrity and authenticity of
the recordings, the data compression techniques used, the synchronicity of
sound and images, compensation for camera movement, and the
conversion of a video stream to a higher resolution image.
We will focus on methods for digital capture and analysis of analogue
and digital multiplex surveillance recordings, state-of-the-art image
enhancement techniques as contrast stretching and de-blurring, as well as
new methods as super resolution, stabilising and automatic tracking.
Since more images are being processed for forensic investigation, new
methods have been developed for answering questions about the interpretation of images. Examples given: Is it possible to read a license plate
number? Is our suspect, or his car, the one depicted in the image? What is
the body length of the robber or the speed of a car? Is it possible to do a
reconstruction of an accident or a shooting incident from the information in
these images? Methods for image comparison, facial comparison with non
standardized images, image reconstruction, and Photogrammetry are presented and discussed. Special attention is given to accuracy of the results
and the impact on the conclusions from these investigations. Furthermore,
there will be a hands on training during this workshop.
Finally, some extra attention is given to the use of 3-dimensional
computer modelling in forensic investigations, since we believe that these
techniques will have an impact on traditional crime scene photography.
Computer models and animations have been recently used for
analysing video by superimposition of computer generated views of the
model on the video images, for the visualisation of complex scenario’s in
animations and for testing scenario’s against video footage and evidence in
crime scene photographs. Examples: the reconstruction of car accidents
from photographs, analysis of blood spatter patterns from photographs
using a computer model of the crime scene, the visualisation of wound
* Presenting Author
channels in computer models of human bodies, the reconstruction of bullet
trajectories, the reconstruction of a burglary using the limited information
in dark images from a multi camera video recording, and the analysis of
firework explosions from video recordings, photographs and geographical
data. Special attention is given to modelling techniques, the accuracy of the
models, methods for visualizing uncertainties and possibly erroneous
suggestions coming from these visualizations.
The use of image processing in the analysis of patterned injury of the
skin, with emphasis on child abuse and as an aid in image analysis in
forensic pathology will be discussed. The interpretation and recognition of
image processing artifacts and image quality issues in forensic pathologic
evaluation will be demonstrated.
Image Processing, Video, 3D Reconstruction
W12
The Pathological Examination
of Deaths in the Elderly
Gregory G. Davis, MD, MSPH*, Jefferson County Medical Examiner’s
Office, 1515 Sixth Avenue South, Room 611, Birmingham, AL 352331601; Patricia J. McFeeley, MD*, Office of the Medical Investigator,
MSC 11 6030, 1 University of New Mexico, Albuquerque, NM 871310001; and Richard E. Powers, MD*, University of Alabama at
Birmingham and State of Alabama Department of Mental Health and
Mental Retardation, 1530 Third Avenue South, SC961, Birmingham, AL
35294-0017
After attending this presentation, attendees will interpret clinical and
pathological findings in the elderly; define clinical and pathological
features of dementia and delirium; will be familiar with the incidence of
abuse in the long term care setting; be able to interpret postmortem findings
in residents of long term care settings, both anatomical and toxicological,
in light of geriatric practice; and be able to distinguish nursing homes,
assisted living facilities, home health, and hospice, including the regulation
and expectations of these entities.
As our society ages, questions concerning quality of care given to and
received by elderly residents of long term care facilities, such as nursing
homes or assisted living facilities, will grow more and more common.
Often these questions will be directed to forensic pathologists, who are
already familiar with injuries and death investigation. Nevertheless, elderly
individuals, much like children, have their own special considerations
when one is evaluating the state of their health. Geriatricians are familiar
with these considerations, but forensic pathologists are less familiar.
Moreover, forensic pathologists are less familiar with the long term care
setting and the implications of various forms of care than are geriatricians.
This presentation will impact the forensic community and/or humanity by
presenting the forensic pathology of the elderly from a geriatrician’s point
of view, thus enhancing the practice of forensic pathologists in serving the
elderly.
This workshop is designed for the pathologist who wishes to learn
about the clinical manifestations and expected findings of advanced age in
order to enhance the pathologist’s practice of forensic pathology. Because
the setting in which death occurs is important in understanding how death
occurs, the workshop will also cover the structure and governance of the
various sorts of long term care facilities where many elderly individuals
die. The workshop will consist largely of didactic presentations. In
particular, the presentations on the clinical expectations of advanced aging
and dementia and on long term care facilities will be given by a geriatric
psychiatrist and neuropathologist who has served for years as the director
of training for state nursing home accreditation inspectors. Handouts
covering the topics will be provided, and there will be time for participant
discussion and interaction.
23
One of the changes that may come with advanced age is dementia, the
impairment of cognitive function that affects 47% of individuals who are
85 years of age or greater. As dementia progresses, the individual affected
regresses so that, like a child, he is unable to care for himself. Significant
behavioral abnormalities occur in up to 75% of demented persons. The
stress that this condition places on the caregiver can lead to abuse which,
like child abuse, is difficult to detect and difficult to prove with an amnestic,
aphasic subject. At the same time, aging brings degenerative changes, such
as osteoporosis or the friability of the skin and its superficial vessels, that
can lead to findings that mimic abusive injuries. Careful correlation of the
circumstances surrounding death with the findings at autopsy can establish
or refute a claim of abuse, but this evaluation is made more accurately with
knowledge of the structural and physiological changes that can be expected
with advancing age. The circumstances surrounding death also depend on
the environment in which death occurs. Knowledge of what constitutes
reasonable and unreasonable care will help in the evaluation of a given
death. Data collected by regulatory agencies can also provide valuable
insights into past deficiencies in care identified during the survey process.
Participants in this workshop will be taught clinical features of aging
and dementia and the workings of various long term care facility organizations, such as nursing homes, assisted living facilities, and home health.
Participants will have a better understanding of the special environment and
medical considerations involved in deaths of elderly individuals from long
term care facilities.
Nursing Home, Assisted Living Facility, Elder
W13
Human Factors, Performance, and
Transportation Safety - The Rest of
the Story: Beyond Alcohol and Other
Drug Impairment
Laurel J. Farrell, BA*, Colorado Bureau of Investigation, 690 Kipling
Street, Suite 4000, Denver, CO 80215; Dennis J. Crouch, MBA*,
Center for Human Toxicology, Biomedical Polymers Building,
20 South 2030 East, Room 490, Salt Lake City, UT 84112-9457; Bonnie
M. Dobbs, PhD*, University of Alberta, Rehabilitation Research Centre,
3-62 Corbett Hall, Faculty of Rehab Medicine, Alberta, T6G 2G4,
Canada; Jana M. Price, PhD*, National Transportation Safety Board,
Research and Engineering (RE-10_, 490 L’Enfant Plaza E., Southwest,
Washington, DC 20594; David L. Strayer, PhD*, University of Utah,
Department of Psychology, 380 South 1530 East, Room 502, Salt Lake
City, UT 84112-0251; Ginger S. Watson, PhD*, National Advanced
Driving Simulator and Simulation Center, University of Iowa, 2401
Oakdale Boulevard, Iowa City, IA 52245; and John D. Weber, MD*,
Webber and Associated, LLC, 12155 Southwest Wildwood Street,
Portland, OR 97224-2919
The objectives of the workshop are to raise the awareness of toxicologists and other scientists who assess human factors contributions to
crashes and highway safety to look beyond alcohol and drug related
impairment; to be aware that cell phone and other distractions, fatigue,
aging and medical conditions are important factors to consider in accident
causation; and to gain an understanding of the models, methods and
practical application of the data from behavioral performance studies.
This workshop will have decided impact on the forensic community.
Those associated with highway and other accident investigations will be
introduced to a series of factors, outside of the usual investigative issues of
alcohol and drug involvement, that play crucial roles in human
performance. Historically, these factors have been largely overlooked by
toxicologists, accident investigators and the general forensic community.
Historically, toxicologists and other accident investigators have
focused on the role of alcohol and other drugs as possible contributing
factors to impaired performance. This focus has been guided in part by
24
epidemiological studies suggesting that alcohol and other drugs (marijuana,
CNS stimulants and depressants) are over-represented in impaired, injured
and fatally injured drivers. It has also been guided by controlled closedcourse and driving simulator studies demonstrating the impairing potential
of many centrally acting drugs. However, highway and other accident
investigations are far more complex than simply identifying a potentially
impairing substance and assuming causation or even contribution.
This workshop is designed to raise the awareness of toxicologists and
other forensic investigators about a number of human factors (often over
looked) that can affect performance in driving and other complex
behavioral tasks. Data will be presented from an international panel of
experts on human factors and performance in the areas of cell phone and
other distractions, fatigue, aging, and medical conditions as well as models
and methods for assessing impaired performance. As cell phone use
increases, there have been growing concerns about the effects on highway
safety and the constructs of effective legislation. Data will be presented
comparing impairment from cell phone use to that of alcohol consumption.
Fatigue has been shown to be a contributing factor in highway safety, yet it
is often overlooked in accident investigations. The National Transportation
Safety Board plays a leading role in this area of research and will discuss
fatigue involvement in highway safety. Medical factors such as those
affecting visual acuity, color discrimination, cardiac sufficiency, asthma,
diabetes and psychiatric disorders and their potential contribution to driving
will be discussed. Closely allied with the medical factors that may
contribute to driver impairment are the complications and health issues
associated with aging. Physicians already help their older patients preserve
their driving abilities by providing health maintenance, but they also can
play a more active role by assessing their patients for medical fitness to
drive. Lastly, to fully understand the literature and research in the areas just
discussed, one must have an understanding of driver distraction models,
assessment methods, experimental measures and the applicability of the
results. By understanding some of the research being done at the National
Advanced Driving Simulator we will gain knowledge in all of these areas.
From this workshop participants will gain an awareness of the
potential contributions to accidents, crashes and highway safety of
numerous human factors such as cell phone and other distraction
distractions, fatigue, aging and medical conditions. Also, they will gain an
understanding of the models, methods and practical applicability of the data
from behavioral performance studies.
Impairment, Human Factors, Safety
W14
State of the Art Infrared and Ultraviolet
Examinations of Documents by the
Video Spectral Comparator
Troy J. Eberhardt, BS*, U.S. Department of Homeland Security, U.S.
Immigration and Customs Enforcement, 800 Westpark Drive, Suite 325,
McLean, VA 22102; John L. Sang, MS*, Sang Forensic Document
Laboratory, One Harbor Lane, Glen Head, NY 11545; Kristina
Kovarik, BS*, Foster & Freeman, 46030 Nanekin Plaza, Suite 170,
Sterling, VA 20166; and Gerald B. “Jerry” Richards, MS*, Richards
Forensic Services, 15307 Alan Drive, Laurel, MD 20707
The goals of this workshop are to help the attendees understand the
theory light relative to VSC Examinations; understand the theory and
application of visible/infrared transmitted, incident, coaxial and oblique
light examinations; understand the theory of longwave and shortwave ultraviolet incident and transmitted light examination; and understand and apply
the appropriate filtration; and to provide understanding of basic microspectrometry applications (e.g., measure absorption, reflectance, transmission,
and fluorescence spectra).
humanity by preparing the document examiner to better understand the
theory behind the analysis and better explain his / her findings.
* Presenting Author
Infrared (IR), Ultraviolet (UV) and visible radiation has been used for
many years in the examination of questioned documents revealing
differences in inks, obliterations, erasures, alterations, deletions and insertions to documents. This workshop is going to explore the theory of light
which makes these examinations possible. Jerry Richards will discuss the
theory of these radiations. Kristina Kovarik of Foster and Freeman will
explain the practical application of these theories and the latest technologies
using a High Resolution Video Spectra Comparator. The workshop will
cover incident visible, IR reflected, transmitted, and Luminescence examinations as well as short and long wave ultraviolet UV examination. Coaxial
illumination and oblique visible and IR light techniques will be explored
and demonstrated. Measurement of absorption, reflectance, transmission
and fluorescence by the Microspectrometry will also be explained. The
workshop will conclude with a group discussion lead by John Sang on the
protocols for theses types of examinations.
Infrared, Ultraviolet, Alterations
W15
Practical Chromatographic Mechanisms
Applied to Solid Phase Extraction
Max B. Erwine, BS*, BGS Varian, 1634 Otte Avenue, Cincinnati, OH
45223; Adam Negrusz, PhD, DSc*, Department of Biopharmaceutical
Sciences, College of Pharmacy, UIC, 833 South Wood Street, Chicago,
IL 60612
After attending this presentation, attendees will have a working
knowledge of Solid Phase Extraction, where it can be applied, a working
knowledge of the fundamentals and a reference to trouble shooting and
other resources.
humanity by improving bench knowledge of chromatography and the use
of solid phase extraction.
This half-day workshop will include a comprehensive discussion on
all aspects of solid phase extraction techniques with some application
examples. The discussion will be divided into Fundamentals, which will
include reasons for using SPE, the steps of SPE, a chromatographic comparison of digital SPE vs. HPLC, silica and as a substrate for SPE, polar,
non polar and ion exchange chemistries will be discussed in detail.
Advanced and alternative approaches will detail improvements in the
retention of polar compounds, trouble shooting, reduction of ion suppression in MS detectors, the use of polymers in SPE, packed bed and disk
technologies and the use of solid supported liquid/liquid extraction
techniques.
Solid Phase Extraction, Chromatography, Sample Preparation
W16
FBI Bank Security Device Workshop
Marc A. LeBeau, MS*, and Ronald L. Kelly, BS*, FBI Laboratory, 2501
Investigation Parkway, Quantico, VA 22135; Joel Bartholf, BS*, 3SI
Security Systems, Ashley Park, Suite 5A, 3902 Northside Drive, Macon,
GA 31210; Phillip H. Grimm, BS*, U.S. Currency Protection
Corporation, PO Box 6021, Scottsdale, AZ 85261; Robert F.
Mothershead II, MA*, Pamela C. Reynolds, BS*, and Michael P.
Rickenbach, PhD*, FBI Laboratory, 2501 Investigation Parkway,
Quantico, VA 22135; and Ronald Scott*, 3SI Security Systems, 5891
Harmony Ranch, Aubrey, TX 76227
After attending this presentation, attendees will be able to further their
knowledge in the area of bank security device products: past, present, and
future. A validated procedure for the analysis of bank dye-pack chemicals
will be introduced and available for scientists to implement. Various analytical techniques will be discussed so that current forensic examiners can
tailor the procedure to what is applicable to their laboratory’s capabilities.
* Presenting Author
In order to adequately analyze bank security device evidence, a
forensic scientist should possess much information about the dye-pack
products and the procedure used to identify chemicals of interest. This presentation will impact the forensic community and/or humanity by
attempting to provide examiners the knowledge and skills to not only
analyze evidence related to bank security device dye-packs, but to adequately testify as an expert in this area.
For many years the Federal Bureau of Investigation (FBI) has been the
lead agency in the analysis of evidence from bank robberies. Bank security
dye-packs expend chemicals when activated during a robbery and contaminate money and other pieces of evidence with specific chemicals. A
forensic scientist should be kept up to date on products related to dye-packs
as well as to analytical techniques and procedures used to detect the
expended chemicals. There is a history in the evolution of dye-pack
products, their manufacturers, and the analytical methods used to identify
specific chemicals on evidentiary items. Active forensic scientists who are
either currently working with bank dye-pack evidence or who are foreseeing a future in analyzing these types of cases will be offered pertinent
information, a validated procedure, and opportunities to discuss issues with
both company representatives and other qualified scientists. Case
examples, evidence packaging, method development issues, and future
products in the area of bank security devices will also be discussed.
Bank Security Devices, Dye-Pack, Procedure
W17
SWGIT Presents: Guidelines for
Acquiring, Processing, Analyzing and
Archiving Video and Image Data
Richard W. Vorder Bruegge, PhD*, FBI, Forensic Audio, Video and
Image Analysis Unit, Building 27958A, Quantico, VA 22135; Carl R.
Kriigel, BS*, U.S. Army Criminal Investigation Laboratory, 4553 North
2nd Street, Forest Park, GA 30297; William R. Oliver, MD*, Georgia
Bureau of Investigation, Northwest Regional Crime Laboratory, 533
Underwood Drive, Trion, GA 30753; and Mark Shuman, MD*, MiamiDade County Medical Examiner Department, Number 1 Bob Hope Road,
Miami, FL 33136
Upon completion of this workshop, the participant will have a better
understanding of how to incorporate proper procedures for handling image
evidence into their law enforcement activities. They will know what sort
of equipment and software they should utilize, how best to document their
procedures, and will also know something about the legal; basis for the presentation of digital evidence in court.
Images and video are intrinsic to law enforcement activities today.
Crime scenes, suspects and evidence are photographed to document steps
in an investigation. Surveillance images are seized and processed in order
to reconstruct events and help criminals. Some images, such as latent print
photographs, are processed and then analyzed to identify suspects. Many
of these images ultimately find their way into the courtroom for use in prosecution. Analyses conducted on these images are frequently crucial to the
successful completion of an investigation.
The increased use of digital imaging technology in law enforcement
has led many defense attorneys to raise multiple criticisms of it and law
enforcement’s procedures, in an attempt to exclude such evidence. In this
environment, it is more critical than ever that law enforcement take active
measures to ensure that its images and imaging procedures can be defended
in the court room. Recognizing this challenge, the FBI formed the
Scientific Working Group on Imaging Technology (SWGIT) in 1997 to
address the myriad of issues that can arise related to the science and technology of imaging. As of June 2004, SWGIT had formally published nine
documents (with more in press) that address issues ranging from general
guidance on chain of custody and the proper media for the preservation of
image evidence, to procedures for image processing, the handling of video
evidence, and advice on training in imaging. The purpose of this workshop
is to acquaint law enforcement personnel with these documents and the
25
guidance contained therein, so that the attendees can incorporate these
guidelines into the procedures within their own agencies and laboratories.
Attendees will learn about chain of custody issues as they relate to
crime scene photographs and surveillance video recordings from both
analog and digital systems. They will also receive guidance regarding
proper procedures for preserving such data and will learn where they can
go to find out more about it.
After a general overview, attendees will then be given some guidance
regarding how to best utilize digital and traditional film systems for the
acquisition of evidentiary photographs at crime scenes and in the laboratory. The selection of cameras and the steps necessary to acquire images
sufficient for the purpose needed will be discussed. This will include a
detailed explanation of image resolution and other factors that should be
considered to determine which camera (and imaging system) is best suited
for the purpose at hand. (It may surprise some to learn that digital imaging
is not the answer to all of law enforcement’s imaging needs!)
Next, attendees will learn about the variety of video surveillance
systems in use throughout the country and SWGIT’s efforts to work with
manufacturers to develop industry standards that meet the evidentiary
needs of law enforcement. This section of the workshop will also address
proper procedures for the capture and processing of video evidence by
properly training personnel.
Once images have been acquired in an investigation, they must be
processed and analyzed to produce results meaningful to an investigation.
SWGIT has developed guidelines regarding what sort of processing steps
are most useful in a forensic setting and has also provided guidance on how
to document those steps. Likewise, SWGIT is developing guidelines to
provide imaging scientists with a set of “Best Practices”, to ensure that the
testimony offered by imaging experts is supported by practices as rigorous
as those applied in other forensic disciplines.
Next, attendees will learn of the recent recognition of “Digital
Evidence” as a discipline subject to accreditation by ASCLD/LAB.
Included within this discipline is the subdiscipline of “Video and Image
Analysis”. SWGIT recognizes that some confusion remains over what
parts of a laboratory might be subject to accreditation under this discipline,
and can provide guidance on this issue.
Finally, many in law enforcement remain concerned regarding the
admissibility of digital images within the courtroom. This workshop will
provide attendees with a reference list of case law, as well as common sense
approaches to this issue, that should help them ensure that their images, no
matter their source, are admitted in court.
Imaging, Image Processing, Digital Evidence
W18
Shooting Reconstruction
Timothy M. Palmbach, JD, MS*, University of New Haven, 300 Orange
Avenue, New Haven, CT 06516; Robert K. O’Brien, MS*, State of
Connecticut, Forensic Science Laboratory, 278 Colony Street, Meriden,
CT 06451; Edward Jachimowicz, BS*, State of Connecticut, Forensic
Science Laboratory, 278 Colony Street, Meriden, CT 06451; and Paul E.
Kish, MS*, PO Box 814, Corning, NY 14830
The goal of this presentation is to discuss scene investigation and
scientific principals involved in the investigation of a shooting incident.
by demonstrating thorough investigation through scientific principals.
This workshop will focus on the investigation and reconstruction of
shooting incidents. Physical evidence and pattern interpretation at the
shooting scene will provide valuable information in conducting a proper
shooting reconstruction. In addition, laboratory analysis and interpretation of
the physical evidence is critical to the reconstruction. Topics such as determination of bullet trajectory, glass interpretation, bloodstain pattern interpretation, GSR/Distance Determination and the national firearm database will be
discussed. Numerous case scenarios will be presented for review.
W19
Understanding the Psychopath:
The Theoretical and Conceptual
Issues Related to Psychopathy and
Their Practical Application to
Understanding Violent Criminals
and Their Behavior
Mary Ellen O’Toole, PhD*, Federal Bureau of Investigation, Behavioral
Analysis Unit, FBI Academy, Quantico, VA 22135; and Robert D.
Hare, PhD*, University of British Columbia, #26 15020 27A Avenue,
Surry, British Columbia V4P 2Z9, Canada
Upon completion of this workshop, the participant should be able to
better understand the theoretical, conceptual and operational issues
associated with psychopathy and its implications for criminal justice and
mental health. Particular attention will be paid to the application of the
theory and research on psychopathy to law enforcement, crime scene
analysis, and criminal investigation and interrogation.
Participants will learn about clinical and non-clinical methods for the
assessment of psychopathy and its association with recidivism and
violence. They also will learn how knowledge about psychopathy can be
applied to crime scene analyses, criminal investigations, hostage negotiations, and interviews and interrogations.
Psychopathy has emerged as one of the most important clinical
constructs in the mental health and criminal justice systems. Although
psychopaths make up only about 15-20% of the criminal population, they
may be responsible for more than half of the serious, violent, and repetitive
crimes. This presentation will impact the forensic community and/or
humanity by assisting in the ability to distinguish between psychopathic
and other offenders, and to understand the implications of this distinction,
is critical for everyone involved in criminal justice.
Dr. Robert Hare has researched psychopaths for more than a 35 years
and is recognized as the world’s foremost expert on the topic.
Psychopathy has emerged as one of the most important clinical
constructs in the mental health and criminal justice systems. The
psychopath is defined by a unique constellation of affective, interpersonal,
lifestyle and antisocial characteristics. These include egocentricity, manipulativeness, callousness, impulsivity, shallow emotions, grandiosity and
lack of remorse for one’s actions. Not every psychopath will have contact
with the criminal justice system. However, the traits associated with this
personality disorder place psychopaths at risk for committing crime and for
acting out violently. Psychopathy is not limited to a remote murder scene
in the middle of a desert. Psychopaths can also be found in board rooms,
and government and political offices throughout the world where they
wreak havoc on co-workers, investors, clients, and others with whom they
come into contact.
Psychopaths and their crimes are different from those of other
offenders: more violent, cold-blooded, and persistent. Their lack of
conscience, remorse and empathy readily allows them to become human
predators, and to engage in instrumental aggression without concern for the
victims or others around them. It is critical for those working in the criminal
justice system to understand and appreciate the significance of this
distinction between psychopathic and other offenders. An assessment of
psychopathy is predictive of response to therapy, recidivism, violence, and
sexual offending. The combination of psychopathy and deviant sexual
arousal is particularly dangerous to society.
This workshop will be two faceted: Information will be presented
regarding both the theoretical and conceptual issues related to psychopathy,
including current research on psychopathy as a risk factor for recidivism,
violence and sexual offending. The assessment instruments for
Psychopathy will be discussed including the Hare Psychopathy Checklist
(PCL-R), the Screening Version (PCL-SV) and Youth Version (PCL-YV).
Shooting Reconstruction, Trajectory, Bloodspatter
26
* Presenting Author
In Part II, information will be presented which “operationalizes” the
psychopathy construct in terms of a crime scene behavior classification
system. This perspective on psychopathy will identify some key behaviors
observed at a violent crime scene which can be indicative of a psychopathic
offender. Utilization of this type of behavior classification system can assist
law enforcement in developing strategies for investigations, interviews and
prosecution of cases involving psychopathic offenders
Psychopathy, Violence, Crime Scene Behavior
W20
The Uses and Abuses of Statistics
and Fordisc in Forensic Anthropology
Richard L. Jantz, PhD*, University of Tennessee, Department of
Anthropology, 252 South Stadium Hall, Knoxville, TN 37996; Stephen
Ousley, PhD*, Smithsonian Institution, Director, Osteology Laboratory,
Repatriation Office, Department of Anthropology, NMNH MRC 138,
Washington, DC 20013-7012; and M. Kate Spradley, MA*, and Nicholas
Hermann, PhD*, University of Tennessee, Department of Anthropology,
Knoxville, TN 37996-0720
Upon completion of this workshop, the participant should be able to
choose among several alternatives of statistical analysis based on the
strengths and weaknesses of each method. The participant will have been
instructed in measurement techniques and will be better able to address the
reliability of a statistical analysis, both his or her own as well as others'
analyses.
Forensic anthropologists increasingly use FORDISC and other
statistical techniques to analyze remains and make probablistic statements
concerning ancestry, sex, stature, and other individuating characteristics.
making the attendees aware of the theory and assumptions underlying each
method in order to choose the best method, to make better estimates, and to
address reliability concerns.
Various statistical procedures, especially discriminant function
analysis (DFA), are being used more and more in Forensic Anthropology.
Several computer programs can be used for statistical analysis, including
SAS, SYSTAT, and FORDISC. The power of DFA lies in the fact that DFA
maximizes the differences in bone size and shape among groups.
FORDISC 2.0 has been used extensively to aid in ascertaining the
biological profile of skeletal remains, especially for ancestry. The impetus
to develop FORDISC came from increasingly frequent requests from
forensic anthropologists to calculate "made-to-order" discriminant functions (DFs) using data from the Forensic Data Base (FDB). Such custom
DFs are necessary when measurements required by published DFs, for
example Giles and Elliot (1962; 1963) or Jantz and Moore?Jansen (1988),
are impossible to obtain. DFs are also desirable when one wishes to
compare the unknown to different reference groups. FORDISC allows
anthropologists to construct DFs using two to eleven modern groups, some
including males and females, using up to 34 craniometrics, or two to four
groups using up to 39 postcranial measurements. Fordisc uses Linear
Discriminant Functions (LDFs) to calculate probabilities of group membership and is easy to use. Perhaps it is too easy to use. In our experience,
many users merely type in measurements and record the classification.
However, there are a number of statistical assumptions and caveats that
need to be addressed in DFA to avoid certain problems, the most consequential being an incorrect classification of remains. The appropriateness of
certain samples should also be considered. For example, LDFs require
approximate multivariate normality and about the same level of variation
among groups in order to produce reliable results. If group levels of variation differ greatly, Quadratic Discriminant Functions or non-parametric
DFA are solutions. Additionally, much research has been devoted to ascertaining the "best" variables to use in DFA. Noise variables do not aid in
* Presenting Author
discrimination and can decrease the accuracy and reliability of DFA.
Stepwise selection of variables is valuable with some cautions. These
methods are available in several statistical software packages and will gradually be incorporated in the next version of FORDISC.
Additionally, FORDISC 2 enabled the easy estimation of stature from
long bone lengths. There are also several cautions worthy of note in
estimating stature.
Attendees will hear lectures on theory, see empirical results that have
practical implications, including case studies, receive instruction in craniometric measurement techniques, learn about emerging powerful new
methods, and analyze example cases
FORDISC, Statistical Analysis, Physical Anthropology
W21
Preparing a Forensics Science Laboratory
for Accreditation Under ISO 17025
Thomas J. Janovsky, BA*, Drug Enforcement Administration, Office of
Forensic Sciences, 2401 Jefferson Davis Highway, Alexandria, VA 22301;
Joseph P. Bono, MA*, Drug Enforcement Administration, Office of
Vickie A. Bailey, MS*, Northeast Laboratory, 99 Tenth Avenue, Suite 721,
New York, NY 10011; Scott R. Oulton, BS*, Department of Justice, Drug
Enforcement Administration, Vista, CA; Jerry A. Walker, MS*, U.S. Drug
Enforcement Administration, Mid-Atlantic Laboratory, 1440 McCormick
Drive, Largo, MD 20774; Donald A. Wyckoff, BA, BS*, 209 East Lewis,
Pocatello, ID 83201
Upon completion of this workshop, the participant should understand
how to prepare a laboratory or laboratory system for accreditation under
ISO 17025 Standards. The preparation of a laboratory system is more
demanding than the preparation of an individual laboratory because of the
coordination required among the Quality Managers in all laboratories.
Different approaches to problem solving must be harmonized to meet the
requirements for the highest quality forensic work product.
humanity by examining the experiences of one large laboratory system in
preparing for an accreditation under ISO 17025 standards, forensic laboratory managers contemplating a similar accreditation status will be
exposed to the successes and potential hurdles in the process.
The objective of this workshop is to present a synopsis of the procedures which were developed to prepare the nine (9) Drug Enforcement
Administration (DEA) Office of Forensic Sciences laboratories for accreditation under ISO/IEC 17025 General Requirements for the competence of
testing and calibration laboratories.
Accreditation is becoming a de facto requirement for the recognition
of a laboratory's operation under documented policies and procedures.
Three states have mandated laboratory accreditation for testifying in courts.
The Drug Enforcement Administration (DEA) laboratory system was
first accredited in 1994, and reaccredited in 1999. These accreditations
were conducted under the standards and criteria of the American Society of
Crime Laboratory Directors/Laboratory Accreditation Board. In 2002 management within the DEA Office of Forensic Sciences made the decision to
pursue the 2004 accreditation of the laboratory system under a program
which would use as a base the International Standard ISO/IEC 17025
General Requirement for the competence of testing and calibration laboratories. Preparation for the 2004 accreditation of the DEA laboratory system
would involve the Quality Assurance Managers from the seven regional
laboratories, the Special Testing and Research Laboratory, and the Digital
Evidence Laboratory. The accreditation also involved assessment visits to
two (2) subregional laboratories, and one mobile laboratory. These three
facilities are under the operational control of a regional laboratory director.
The Office of Forensic Sciences Quality Assurance Manager had the
27
overall responsibility for coordinating the preparation of these twelve facilities for the accreditation process. The assessments included the following
forensic disciplines: drugs, fingerprint comparisons and identifications,
toolmarks examinations on solid dosage units, and digital evidence.
Accreditation of a laboratory system with a significant number of
laboratories spread across the United States required planning and coordination. Since the 2004 accreditation would be conducted under a set of
standards different from the two previous accreditations, significant
training of personnel from each laboratory was required to familiarize individual laboratory management with the requirements of ISO and the
accrediting body.
The following is a synopsis of the steps which brought the accreditation process to a successful completion:
• The appointment of a Quality Assurance Manager within the
Office of Forensic Sciences to coordinate the accreditation process.
• The familiarization of Quality Assurance Managers within each
laboratory with the standards for an ISO accreditation program.
• Internal pre-accreditation inspections of all laboratories.
• Periodic meetings of key individuals within the laboratory system to
discuss and develop responses to each of the requirements for
accreditation. This involved enhancing the laboratory system's
policies and procedures to meet the requirements.
• The compilation of a conformance file to address each individual
requirement for accreditation under an ISO program.
In June 2004, the Federal contract for accreditation of the DEA laboratory system was awarded to the American Society of Crime Laboratory
Directors/Laboratory Accreditation Board. (ASCLD/LAB). The
ASCLD/LAB International Program provides accreditation of forensic sciences laboratories under ISO/IEC 17025 requirements, enhanced by
ASCLD/LAB-International Supplemental Requirements. The latter are
based on the elements of the ASCLD/LAB Legacy Accreditation Program
and ILAC Guide 19. After award of the contract to ASCLD/LAB, the
preparation of the DEA laboratory system continued with a focus on
meeting the specific requirements of the accrediting body.
An important part of this workshop will involve detailed discussions
of those accreditation requirements which caused a significant degree of
concern and fell outside of the "comfort zone" of familiarity with previous
accreditation inspections. The discussions in this workshop will be candid.
The goal of the organizers is to present suggestions for developing viable,
practical suggestions for achieving accreditation under an ISO accreditation program for a forensic science laboratory.
Laboratory Accreditation, ISO/IEC 17025, Drug Enforcement
Administration
W22
Evidence-Based Forensic Science:
Interpreting Postmortem Toxicology
in the Light of Pathologic Findings
Paul Fornes, MD, PhD*, Anatomie Pathologique, Department of
Pathology, Hopital Europeen Georges Pompidou, 20, rue Leblanc,
Paris, 75015, France; Barry K. Logan, PhD*, Washington State Patrol,
2203 Airport Way, SOuth, #360, Seattle, WA 98134-2027; Marc D.
Bollmann, MD*, Institut Universitaire de Médecine Légale, Rue du
Bugnon 21, Lausanne, CH-1005, Switzerland; Olaf Drummer, PhD*,
Monash University, Department of Forensic Medicine, Victoria,
3800, Australia; A. Robert W. Forrest, MB ChB, LLM*, University of
Sheffield, Department of Forensic Pathology, Medico-Legal Center,
Watery Street, Sheffield, South York S3 7E5, United Kingdom; Bruce A.
Goldberger, PhD*, University of Florida, College of Medicine, 4800 SW
28
35th Drive, Gainesville, FL 32608; Graham R. Jones, PhD*, Office of the
Chief Medical Examiner, 7007-116 Street, NW, Edmonton, Alberta T6H
5R8, Canada; Steven B. Karch, MD*, PO Box 5139, Berkeley, CA 947050139; Christopher M. Milroy, MD, PhD*, University of Sheffield,
Department of Forensic Pathology, Medico-Legal Center, Watery Street,
Sheffield, South York S3 7E5, United Kingdom; Ashraf Mozayani,
PharmD, PhD*, Harris County Medical Examiner's Office, 1885 Old
Spanish Trail, Houston, TX 77054; and Derrick J. Pounder, MD, ChB*,
University of Dundee, Scotland, Department of Forensic Medicine,
Dundee, Scotland DD1 4HN, United Kingdom
After attending this presentation, this joint Toxicology/
Pathology/Biology workshop will provide both toxicologists and pathologists with guidelines in interpreting toxicology in the light of pathological
findings in assessing the cause of death.
Evidence-based medicine has become one of the major driving forces
in clinical practice, with an impact on education, policy making and
research. Evidence-based medicine is the conscientious, explicit, and judicious use of current best evidence in making decisions about the care of
individual patients. The practice of evidence-based medicine means integrating individual clinical expertise with the best available external clinical
evidence from systematic research (1). Can this new paradigm be applied to
forensic sciences, in particular to forensic toxicology and pathology ? As
far as the determination of the cause and manner of a death is concerned,
the presence of a substance in a body raises the question of its possible role
in the death. Attempts at directly relating postmortem blood drug concentrations to outcomes only seem reasonable to those unaware of just how
many variables need to be considered. In addition to a thorough account of
what was observed at the scene and an inquiry into the decedents past
medial history, the medical examiner should integrate both toxicological
and pathological findings. It is the purpose of this joint
toxicology/pathology workshop to provide the forensic physician with the
most advanced and objective knowledge in both toxicology and pathology,
in accordance with principles of forensic-based medicine.
The following presentations will examine toxicological and pathological issues of practical relevance to the assessment of the cause of death.
1. Introduction. The principles of evidenced-based medicine.
2. Sampling guidelines for toxicology.
3. Hair Testing : Why Postmortem Toxicology is Incomplete Without it.
4. Back Calculation, is the Process Ever Legitimate in the Dead ?
5. Postmortem Redistribution
6. Influence of pharmacogenetics and impaired metabolism in chronic
accumulation of medications
7. Interpreting Toxicology in the Light of Pathologic Findings
a) Cardiac Pathology
b) Other Pathologic Findings
8. Alternative Explanations for Sudden Cardiac Death, an Introduction
to the Molecular Biology of Ion Channel Disease.
9. Interpreting Postmortem Opiate Measurements ; Methadone,
Oxycodone, Bupranorphine, and Other Substitutes Drugs.
10. Interpreting Postmortem Stimulant Measurements: Cocaine,
Methamphetamine, and MDMA
11. Determining the Role of Doping in Sport-Related Deaths.
12. Special Situations
a) Murder by Succinylcholine
b) Murder by Epinephrine
c) Euthanasia - Does Toxicology Testing Help?
d) Is Murder by Breast Feeding Possible ?
13. Illustrative(s) Case(s)
14. Discussion
(1) Sackett DL, Rosenberg WMC, Gray JAM, Haynes RB, Richardson
WS. Evidence-based medicine: what it is and what it isn't. BMJ 1996;
312: 71-2.
Toxicology, Pathology, Cause of Death
* Presenting Author
W23
Quality Assurance in Forensic Anthropology
Vincent J. Sava, MA*, Andrew J. Tyrrell, PhD*, and Thomas D.
Holland, PhD*, JPAC CIL, 310 Worchester Avenue, Building 45,
Hickam AFB, HI 96853
After attending this presentation, attendees will understand the basic
quality assurance principles and measures applicable to forensic anthropologists. Participants will learn the unique challenges faced by forensic
anthropologists when striving to have their facilities, procedures, and
casework meet the standards demanded by the criminal justice system.
Attendees should be able to utilize the material presented to formulate a
quality assurance program for their organization.
Quality assurance in forensic laboratories and programs has become a
growing trend over the past decade. This presentation will impact the
forensic community and/or humanity by demonstrating how formal quality
assurance programs can lead to objective and measurable standards and
performance that ultimately strengthen and elevate the forensic science
profession as a whole.
Quality assurance programs in forensic laboratories and activities
have been a growing trend over the past decade. Since 1999 the Joint
POW/MIA Accounting Command, Central Identification Laboratory
(JPAC-CIL) has implemented a stringent quality assurance program to
ensure the scientific integrity of its casework. The CIL's quality assurance
program ultimately led to the Laboratory's accreditation by the American
Society of Crime Laboratory Directors Laboratory Accreditation Board
(ASCLD-LAB) in 2003--the first forensic skeletal identification laboratory
to be so credentialed.
The goal of this workshop is to introduce the attendee to the CIL's
Quality Assurance Program and to convey the lessons learned resulting
from its implementation and growth. A video overview of the JPAC CIL is
presented followed by an overview of its quality assurance program. In the
latter, the concept of the scientific integrity of the laboratory is discussed
followed by a summary of the "Surety" model of quality assurance.
The participants will become familiar with each measure that comprises the surety model of quality assurance. The importance of integrating
and synchronizing all of the surety measures discussed during the
workshop will be continually stressed. In Part I, infrastructure and support
considerations necessary for a successful quality assurance program are
also presented. Surety measures addressed include:
• Desired qualities of a laboratory manual and other vital documentation
• Adequacy and safety of facilities
• Policies and procedures conducive to a positive work environment
• Evidence management and security
• Training and professional development
Gathering and interpreting evidence is the focus of Part II where
quality assurance in field operations and trace evidence analysis is discussed. The surety measures directly related to casework--the peer review
process, validation of technical procedures, case file management, analytical notes and documentation--are presented for consideration.
Quality assurance procedures and programs are ineffective in the
absence of monitoring, enforcement, and corrective action. These are
accomplished through a myriad of surety measures including proficiency
testing, review of court testimony, audits, annual reports, and corrective
action policies, which are presented in Part III.
In closing, the attendees will become acquainted with the problems
that hindered, and the processes that led to, the accreditation of the JPAC
CIL. In closing, surety assistance programs offered by the CIL will be discussed in the event an attendee's organization desires assistance with their
surety programs or accreditation efforts.
A question and discussion period follows the conclusion of the presentation portion of the workshop.
Quality Assurance, Forensic Anthropology, Accreditation
* Presenting Author
W24
The Forensic Nurse Death Investigator
as a Member of the Multidisciplinary
Forensic Investigative Unit
Donna M. Garbacz Bader, MSN, RN*, Bryan LGH, College of
Health Sciences, 5035 Everett Street, Lincoln, NE 68506; Virginia A.
Lynch, MSN, RN*, Beth EL College of Nursing, University of Colorado,
514 Hopi Circle, Divide, CO 80814; Vincent J.M. DiMaio, MD*, Bexar
County Medical Forensic Science Center, 7337 Louis Pasteur, San
Antonio, TX 78229-4565; and Stacey Mitchell, MSN, RN*, and Luis
Arturo Sanchez, MD*, Office of the Medical Examiner of Harris County,
1885 Old Spanish Trail, Houston, TX 77054
Upon completion of this workshop the participant will be able to
identify and discuss the correlation of scientific nursing education to the
field of forensic science, specifically to that of death investigation.
humanity by increasing the availability of knowledgeable, competent individuals to assist the healthcare and legal system in relevant assessment and
documentation in the field of death investigation.
Death investigation is a complex process, one that involves accurate
data collection, communication and documentation. As a science dealing in
an objective assessment of death, the investigative process requires a
degree of knowledge in human anatomy and physiology, psychology, basic
chemistry and physics. A variety of disciplines are essential in order to
accurately assess, interpret and correlate the various elements involved in
decedent identification, cause and manner of death, support and encouragement to survivors, and to maintain channels of communication with
additional investigative personnel.
Members of the multidisciplinary death investigative team have
routinely included law enforcement agencies, crime laboratory personnel,
and medical examiner and/or coroner (ME/C) investigators. Additional
team members, include those specializing in forensic engineering, odontology, anthropology and the behavioral sciences. Forensic Nurse Death
Investigators (FNDI) have recently become valued members of death
investigative systems and are increasing in many ME/C jurisdictions.
The educational requisites of the FNDI include specific aspects of each of
these various forensic disciplines with which they regularly interface.
Forensic nurse examiners (FNE) in the United States are recognized
for their clinical education and experience in the biomedical sciences. The
FNE is accomplished in the application of scientific process to objective
data collection, evaluation and interpretation of that data, including the
implementation of methods essential to the investigation of suspicious
deaths. Forensic nursing science requisite skills involve observation, documentation and assessment of objective data, human anatomy and physiology, basic chemistry and biochemistry, microbiology, physics and pharmacology. Familiarity with human psychology in response to both internal
and external stressors helps to prepare the FNE for the task of death notification. In addition, an understanding of cultural family systems and
available community resources is essential in order to provide direction and
support to the bereaved. Thus the FNE is uniquely qualified to fill the role
of the forensic death investigator.
ME/Cs who employ FNDIs appreciate the educational requirements
for an individual to become a licensed professional. Scientific based education and critical thinking skills allow the forensic nurse examiner to recognize and recover physical and biological evidence with laboratory specification. The ability to identify specific human elements basic to normal
physiological and psychological functions across the life span as well as
assist the forensic nurse examiner in the identification of trauma in human
remains.
Considering that the majority of all reported ME/C cases are
comprised of natural deaths, the biomedical expertise of the FNDI provides
for differentiation between disease process and suspicious deaths with
29
reasonable certainty. One emerging application of the FNE in death
investigation is providing postmortem sexual assault examination prior to
autopsy. Forensic pathologist and the FBI criminal laboratory find the FNE
exceptionally qualified as experts in the evaluation of sexual assault trauma
and collection of biological evidence.
A question frequently asked is: What qualifies the Registered Nurse to
participate in death scene investigations, postmortem procedures and
provide expert witness testimony? To examine the evolution of a forensic
specialist in nursing, one must first consider the initial education, which
begins as a nurse matriculates through an accredited nursing program.
Basic nursing curricula focus on a strong physical and psychological
science base, including human anatomy and physiology, chemistry,
biology, basic and advanced mathematics, physics, behavioral sciences,
and general courses in the fine arts.
The scientific process is applied throughout all aspects of general
nursing curricula; the basic sciences are correlated to various body systems
and related natural disease. Legal and ethical issues are a major component
of each course. Graduates are eligible to apply for licensure examination
developed by the National Council of State Boards of Nursing. The
successful candidate is awarded the designation of Registered Nurse and
licensed to practice, independent of physician licensure. At this juncture,
nurses with an interest in the forensic sciences seek out accredited forensic
nursing science programs.
In recent years, undergraduate, graduate, and postgraduate programs
in forensic nursing science have been developed and are continuing to
develop across the U.S. and abroad. These programs offer specific forensic
curricula in the scientific investigation of injury and death, human abuse,
forensic chemistry, crime scene/crime laboratory, forensic photography,
toxicology, victimology, traumatology, sexual violence, human rights,
psychosocial and legal aspects of forensic science, among others.
Advanced forensic nursing curricula pursues pathophysiology, research,
epidemiology, consulting, curriculum design and informatics. As generally
happens, the greater desire for knowledge promotes higher academic goals.
To date, four accredited United States (U.S.) universities offer doctorate
level forensic nursing degrees. As principle research investigators and
associates to forensic pathologists, it is believed that future advance
practice forensic nurse examiners will assist in alleviating a global shortage
in competent forensic services pertaining to the scientific investigation of
death.
In tribute to the AAFS, forensic nursing was first recognized as a
scientific discipline at the 43`d annual meeting in 1991 (Anaheim,
California). The International Association of Forensic Nurses (IAFN), patterned after the AAFS, was founded in 1992. In 1995 the American Nurses
Association (ANA) Congress of Nursing Practice bestowed formal recognition to forensic nursing as an official nursing specialty, and in 1997, the
IAFN published the Standards and Scope of Forensic Nursing Practice in
conjunction with the ANA. IAFN board certification for the forensic nurse
examiner in both adult and pediatric sexual assault examination and
evaluation was implemented in 2001. Development of specific standards
and national certification in biomedical investigation for the Forensic Nurse
Death Investigator is currently in progress through the IAFN. This certification will include professional standards in postmortem sexual assault
examination for those who practice in this field.
The utilization of the FNDI provides competent individuals skilled in
the biomedical investigation of death. Where perpetrator prosecution may
be indicated, successful resolution to questioned death related issues instills
confidence in the health and justice systems and contributes to community
mental health through social justice.
This workshop will address the development of forensic nursing
education programs, certification examination, role clarification,
investigative case management, and multidisciplinary team relationships.
Case examples are presented in which the FNDI's biomedical skills benefit
the forensic pathologist in the analysis of fatal injuries and medical deaths.
The foremost FNDI investigative program in the U.S. will present an
overview of the Medical Examiners Investigative Unit comprised
exclusively of Forensic Nurse Death Investigators. Discussion of the
30
unlimited potential for FNDIs in developed and developing countries is
previewed with data related to existing programs and those currently
developing.
Death Investigation, Forensic Nurse Death Investigator, Forensic
Nurse Examiner (FNE)
W25
Identifying Printmaking Techniques
Through the Artistic Process
Troy J. Eberhardt, BS*, Department of Homeland Security, Immigration
& Customs Enforcement, 800 Westpark Drive, Suite 325, McLean, VA
22102-3105; William J. Farrell, Jr., MS*, Forensic Consultant, PO Box
6974, Metaire, LA 70009; Anna C. Baskin, MA*, 7619 Burthe Street, New
Orleans, LA 70118; and Peter Belcastro, MS*, and Gabriel Watts, BS*,
FBI Laboratory, 2501 Investigation Parkway, FBI Academy Complex,
Quantico, VA 22135
The goal of this workshop is to provide for a better understanding of
scientific techniques, applications and future implications on the
printmaking industry. Ideally, the scientific community will gain a more
accurate and detailed understanding of the processes used in printmaking
so that detection and analysis will be better accomplished.
humanity by providing the forensic document examiner a greater
understanding of printmaking through fine arts processes and gain
knowledge of the cross over between industrial printing and fine art
printing.
The attendees of this workshop will be introduced to the artist
techniques and the ongoing use/development of Printmaking. Printing
techniques, inks and paper are continuously being updated over time by
artists as well as the printing industry. A discussion of the history of printmaking will be presented along with ideas of future techniques in the
printing industry. This program will consider the traditional methods of
printing (lithography, intaglio, wood cut relief, silk screen, pad printing,
photo polymer plates, letter press) as well as future implications of
computer applications, digital, and holography printing.
Printmaking, Artist Techniques, Traditional Printing
WS1 Filicide: Risk Factors and
Psychological Aspects
Karen F. Ross, MD*, Jefferson Parish Forensic Center, 2018 8th
Street, Harvey, LA 70058; and John W. Thompson, Jr., MD*, Tulane
University School of Medicine, Department of Psychology and
Neurology, TB53 1440 Canal Street, 10th Floor, New Orleans,
LA 70112
The goal of this presentation is to define filicide and related forms
of child abuse; list the 3 general categories of fatal child abuse; list
previous classifications of filicide; list maternal, paternal and infant risk
factors for filicide; discuss psychological aspects of filicide including
motivating factors in the absence of insanity; note the differences
between filicide perpetrators and other perpetrators of child abuse.
humanity by discussing filicide in a way that will strive to enlighten
those that investigate these tragic cases about the risk factors in the
parents and the child, and motivating factors in the absence of insanity
as well as approach to evaluation of psychological make-up of the
perpetrator in hope of providing preventive measures and improve the
adjudication of such cases.
* Presenting Author
Filicide is the killing of a child by a parent at any age. While all
child abuse cases are tragic, none provoke more questions and emotional
response than the case of a child (or sometimes multiple children) who
is killed by a parent. This may result at least in part because of the
incongruity between societal expectations that parents should love,
nurture and protect their offspring and the reality in such cases that they
brutally abuse and murder them.
This workshort begins with an overview of the broad categories of
child abuse (gentle homicide, battered child Syndrome, and Impulse
Homicide), then offers a review of previous classifications of filicide,
discusses risk factors for filicide including motivating factors and
psychological aspects and addresses ways in which filicide perpetrators
differ from other perpetrators of child abuse including increased
likelihood of mental illness. Differences in motivating factors and
psychological features of the perpetrators will be discussed in context of
the 3 broad categories as listed above also.
Filicide, Child Abuse, Psychological Evaluation
poisoning explained the course of Napoleon's entire illness, with the
exception of the last several weeks, when he believes the emperor also
suffered from antimony poisoning as a result of too much tartar emetic
and from mercury poisoning as a result of too much calomel. Forshufvud
explained his hypothesis in a 1961 book titled Who Killed Napoleon? He
later obtained one of the hair strands that had been cut from Napoleon's
head the day after his death. This piece of hair was analyzed for arsenic
by neutron activation analysis, at the British Atomic Energy
Establishment in Harwell. The results, which were published in 1962 in
the journal Nature, showed that the hair contained more than 10 parts per
million of arsenic, well over 10 times the normal value. Other specimens
of Napoleon's hair have also been proven to contain arsenic.
However, the cause of Napoleon's death is still being debated by
historians.
Finally, the following issues will be discussed: Was arsenic a contaminant, or was it inhaled or ingested, and was it actually the cause of
death? If Napoleon did have gastric carcinoma, did he die of it or with
it? Was Napoleon murdered? By whom? How would have the murderer
used arsenic? What could have been the motive?
Napoleon, Hair Testing, Arsenic
WS2 Latest Advances in Hair Testing and
Cardiac Electrophysiology Applied to
the Determination of the Cause of
Death of Napoleon Bonaparte
Paul Fornes, MD, PhD*, Department of Pathology, Hospital
E.G. Pompidou, 20, rue LeBlanc, Paris, 75015, France; and
Steven B. Karch, MD*, PO Box 5139, Berkeley, CA 94705-0139
After attending this presentation, attendees will be able to examine
comparatively the results obtained by different technologies :
Instrumental Neutron Activation Analysis, Graphite Furnace Atomic
Absorption Spectroscopy, Inductively Coupled Plasma Mass
Spectrometry, Electrothermal Atomic Absorption Spectrometry,
Synchrotron and X-Ray fluorescence, and Nano-Secondary Ion Mass
Spectrography. Analytical procedures and decontamination methods will
be examined. Limitations of these methods will be discussed; and will
be able to examine the possible roles of arsenic, mercury chloride
(calomel), and tartar emetic (antimony potassium tartrate), in the light of
most recent cardiac electrophysiological studies. These findings will be
discussed in the light of autopsy findings and historical background.
The present forensic works will impact the forensic community
and/or humanity by contributing to improve our knowledge of history.
On May 5, 1821, Napoleon Bonaparte died at the age of 51, on
Saint Helena island, where he was detained in exile since October 1815.
An autopsy was performed by Francesco Antommarchi, Napoleon's
personal physician, witnessed by seven British medical officers.
Antommarchi's report described among other findings, a perforated
gastric ulcer contained by adhesions to the liver. The gastric lesions were
considered cancerous, but there was no peritonitis, nor peritoneal
carcinosis, nor visceral metastases. Yet, most history books state that
Napoleon died of cancer of the stomach. In accordance with his wishes,
Napoleon's hair was then cut off and strands were distributed as keepsakes to the various members of his establishment. In 1840, Napoleon
was exhumed on the order of the French government, and the remains
were then brought to Paris, where they now rest in the Hotel des
Invalides.
After studying various reports, a Swedish dentist named Sten
Forshufvud concluded in the early 60s that acute and chronic arsenic
* Presenting Author
WS3 Chemistry of Voodoo:
Murder in the French Quarter
Richard C. Froede, MD*, 3930 North Placita de la Escarpa, Tucson,
AZ 85750; Frank Minyard, MD*, New Orleans Coroner Office, 2700
Tulane Avenue, New Orleans, LA 70119; Walter H. Birkby, PhD*,
Forensic Science Center, 2825 East District Street, Tucson, AZ 85714;
Homer R. Campbell, Jr., DDS*, Office of the Medical Investigator,
MSC11 6030, 1 University of New Mexico, Albuquerque, NM 871310001; and Suzanne M. Froede, MA*, 3930 North Placita de la
Escarpa, Tucson, AZ 85750
Upon completion of this presentation, attendees will understand the
fundamentals of crime scene investigation; understand the need for team
cooperation in death investigation; appreciate the procedures followed in
a Coroner’s court; and understand the practice of “voodoo” and it’s
chemistry.
Welcome to New Orleans, a fabulous city for fun, frolic and
mystery. It’s a city with wonderful restaurants and tantalizing food;
great jazz and Cajun music; moonlight nights on the Mississippi;
carriage rides; marvelous coffee and beignets; Bourbon Street; hurricanes; and Voodoo.
New Orleans also has a seamy/steamy side; muggings, scams;
corruption; and MURDER! An opportunity will be afforded to the
amateur detective to analyze and solve a series of murders. The participants to analyze and collect evidence will use on-scene investigative
techniques. The participants; powers of observation and knowledge of
pathology will be challenged to determine the cause of death and to find
the killer. A police detective and medical examiner will be there to assist
you, but you must be careful of the representatives of the media. The
objectives in these cases are to develop skills in analyzing and
reconstructing a crime(s) as well as to determine motivation in cases
where there is conspiracy and complicity.
Investigation, Chemistry and Toxicological, Coroner’s Court
Procedures
31
Criminalistics
B1
Evaluation of Y-STR Multiplexes
for Analysis of Casework Samples
Lora Bailey-Van Houten, BS*, Office of the Attorney General, Bureau of
Forensic Services, Fresno Regional Laboratory, 5311 North Woodrow
Avenue, Fresno, CA 93740; and Sulekha R. Coticone, PhD, California
State University, Department of Chemistry, 2555 East San Ramon Avenue,
Fresno, CA 93740
After attending this presentation, attendees will learn the relative
abilities of various Y-STR multiplexes for forensic use.
humanity by assisting in the ability to determine relative performance of
Y-STR multiplexes.
Fluorescence-based DNA detection systems are being widely in
forensic DNA analysis. These methods have greatly assisted the sensitivity
and ease of measurement of PCR amplified short tandem repeat (STR)
alleles. In multiplexed STR genotyping kits, fluorescent dyes are
covalently coupled to one primer for each locus. These STR multiplexes
amplify 13 autosomal STRs with a power of discrimination of over one in
a billion and have proven invaluable in identification of perpetrators of
violent crimes. However, sexual assault cases often contain a mixture of
DNA from the male perpetrator and the female victim that are difficult to
interpret using autosomal STR kits, due to the presence of excess female
DNA in these samples as compared to the male DNA. By using male polymorphisms on the Y chromosome, male DNA can be identified specifically
in male-female mixed samples.
The present study was conducted to evaluate two recently introduced
commercial Y-STR multiplexes (Promega’s PowerPlex® Y and Reliagene’s
YPlex 12). The robustness of the multiplexes was determined by sensitivity
studies. The sensitivity data indicated that both kits were sensitive, although
the YPlex 12 displayed consistently higher peak heights. Additional stutterlike peaks were noticed in pristine male samples at DYS392, DYS389II,
DYS437 and DYS385 loci, though no artifacts were noticed when amplification was performed with female DNA. Further analysis of these artifacts
need to be performed to determine the origin of these additional peaks.
Mixture studies indicated that the limit of detection of the minor component
in a male:male mixture was 1:5 (for YPlex 12) and 1:2 (for PowerPlex® Y).
Researchers also performed CEPH family studies to demonstrate Mendelian
inheritance of the Y-STR loci. To assess the ability of the multiplexes to
analyze forensic samples, testing on blood, oral swabs and male-female mixtures as well as previously adjudicated sexual assault samples were performed. Based on these studies, the relative ability of the two multiplexes to
successfully analyze a variety of forensic was determined.
Y-STRs, Multiplexes, Casework
B2
Optimization of the Extraction of Total
Ribonucleic Acid (RNA) From Semen
Rachel A. Bartholomew, PhD*, FBI Laboratory, FBI Academy,
Counterterrorism and Forensic Science Research Unit, Building 12,
Quantico, VA 22135; Jack Ballantyne, PhD, and Jane Juusola, BS,
University of Central Florida, PO Box 162366, Orlando, FL 32816;
Richard Guerrieri, MS, and Rhonda Craig, MS, FBI Laboratory, DNA
Analysis Unit 1, 2501 Investigation Parkway, Quantico, VA 22135; and
Kevin W.P. Miller, PhD, FBI Laboratory, FBI Academy, Counterterrorism
and Forensic Science Research Unit, Building 12, Quantico, VA 22135
humanity by demonstrating how messenger RNA expression patterns can
provide cell and tissue specific information that can be used to positively
identify a tissue or body fluid source. Subsequent amplification of mRNA
via RT-PCR using tissue specific genes can be to identify the tissue/body of
origin.
Although DNA technology can be used to identify (i.e., type) a
suspect, the source of DNA itself (blood, semen, etc.) cannot always be
definitively identified. Therefore there is a need for the development of
tissue or body-fluid specific protocols to identify forensically relevant body
fluid or tissue samples. The development and use of RNA technology may
complement existing DNA technology where the source of the stain
(i.e., body fluid or tissue type) can be identified by examining the
expression profile of body fluid or tissue-specific genes. Each cell type has
a distinctive pattern of messenger RNA (mRNA) expression. Messenger
RNA expression patterns provide cell and tissue specific information that
can be used to positively identify a tissue or body fluid source. Subsequent
amplification of mRNA via RT-PCR using tissue specific genes can be to
identify the tissue/body of origin.
The RNA extraction protocol was streamlined for ease of use in the
forensic laboratory. The traditional RNA extraction protocol is lengthy,
produces toxic bi-products (i.e., phenol), and requires a skilled user. To be
validated and used in casework, stringent quality control measures must be
performed on each batch of new reagents, decreasing sample throughput.
The use of a RNA extraction kit has several benefits: (i) increased sample
throughput, (ii) lack of toxic/hazardous chemical bi-products, (iii) ease of
training, and (iv) “built in” quality control measures.
The extraction of RNA from liquid body fluids was optimized using
cryopreserved human semen. RNA was extracted from 0.5-500ul of semen
using the RNAeasy Micro kit (Qiagen, Valencia, CA). The Agilent 2100
Bioanalyzer was used to determine RNA quantity and quality, including
RNA Integrity Number (RIN) analysis. RNA samples (0.5pg to 50ng) were
reversed transcribed using the Sensiscript Reverse Transcription kit
(Qiagen, Valencia, CA). PCR products were amplified with semen-specific
Protamine-1 primers. The subsequent PCR products were analyzed using
the Agilent 2100 Bioanalyzer.
The amount of total RNA extracted from semen samples ranged from
9pg/ul to 20ng/ul. RNA quality was variable, with RINs ranging from
1-8.6 (scale 1-10). RNA samples having a RIN of 1 lacked 18S and 28S
ribosomal peaks, but still contained quantifiable RNA. Samples with a
RIN of 8.6 contained intact 18S and 28S ribosomal RNA bands. RNA
samples (degraded and non-degraded) were efficiently reverse transcribed
and amplified to produce a semen specific RNA product. A semen-specific
Protamine-1 RT-PCR product was obtained from as little as 5pg (RIN=7.4)
or 15-25 pg (RIN=1).
The amplification of a semen specific product was possible with
degraded RNA, suggesting that RNA can be used for cellular source attribution even when there is a question regarding the overall integrity of the
sample. The potential benefits of an RNA based approach for body fluid
stain or tissue characterization include: (i) the ability to perform parallel
tests for numerous markers of a single body fluid in a single assay format,
(ii) the ability to perform parallel tests for different body fluids in a single
assay format, (iii) a definitive identification of body fluids for which
presently no specific test exists, and (iv) the ability to automate the process.
The use of RNA technology could supersede current protocols for forensic
body fluid identification.
Serology, Semen, RNA Analysis
The goal of this presentation is to optimize the extraction of total
ribonucleic acid (RNA) from body fluids for reverse transcription
polymerase chain reaction (RT-PCR) and subsequent determination of
source attribution.
32
* Presenting Author
B3
Verification of STR Alleles by
Alternative Primer Pairs Through
a Singleplex PCR System
Eng Seng Simon Lim, BS*, Hui Koon Joyce Lai, BS, Chien Tien Grace
Law, BS, Hui Koon Joyce Low, BS, and Wai Fun Tan-Siew, MS, Health
Sciences Authority, DNA Database Laboratory, 7 Maxwell Road, MND
Building Annex B, #05-04, Singapore, 069111, Singapore
The Singapore National DNA Database Laboratory uses the ABI
IdentifilerTM kit for DNA profiling of the 13 CODIS loci. Routinely,
researchers encounter allele ambiguities such as off-ladder range alleles,
microvariant alleles, allele peak imbalances and tri-alleles among the
different DNA loci typed. In order to determine whether these are true
alleles or PCR artifacts, alternative primers of the questioned DNA locus
are used to confirm the alleles typed. An allele is automatically assigned by
its DNA locus specific Genotyper™ macro. Using the FGA locus as an
example, the singleplex PCR of the questioned DNA locus approach is
described here.
humanity by demonstrating how the systematic singleplex PCR approach
with automated allele assignment method will allow routine confirmation
and resolution of STR allele ambiguities encountered during routine DNA
profiling in the laboratory.
PCR artifacts such as stutter products and non-template nucleotide
additions and other factors such as microvariants, allele dropout, allele
imbalance and mutations can arise that may interfere with the clear interpretation and genotyping of the alleles present in the DNA template.
In the National DNA Database Laboratory, the Identifiler™ DNA
typing kit is used in routine DNA profiling. The DNA is extracted and
amplified from blood stained FTA™ collection cards of convicted
offenders. Duplicate DNA typing is performed for each sample and results
are compared for consistency and quality before uploading into the CODIS
system. On some occasions, heterozygote allele peak imbalances, three
banded allele patterns, off-ladder range alleles, microvariant alleles and
spurious PCR artifacts are encountered. In order to resolve interpretation
difficulties and allow genotyping of the correct STR alleles present in the
DNA template, alternative fluorescent (6-FAM) labelled primer pairs using
Promega® Powerplex™ 16 or mini STR primer (Butler et al. 2003)
sequences of each DNA locus are obtained. For each DNA locus, amplifying the alleles obtained from either the diluted Identifiler™ or
Powerplex™ 16 allelic ladders as template creates the allelic ladder. A
Genotyper™ macro is then written for automated allele assignment based
on the amplified ladders for each DNA locus. The questioned DNA
samples are then amplified using the DNA locus-specific singleplex PCR
primers. Alleles are assigned on the PCR products using its DNA locusspecific Genotyper™ macro. The identity of the PCR products is verified
as either as PCR artifacts or as true allele amplified from the DNA templates.
An example of this approach using the FGA locus is discussed here.
The Powerplex™ 16 primers for the FGA locus are used. Out of the 70
blood samples with allele peak ambiguities observed using the Identifiler™
DNA typing kit, 29 samples were confirmed to be off-ladder range alleles,
30 samples with peak imbalances were corrected and 10 tri-alleles were
verified. The corrected imbalanced peak indicated point mutations at the
primer binding position of the Identifiler™ FGA primers. Off-ladder range
alleles were confirmed to be alleles of the FGA locus. The remaining
sample with an imbalance peak typed using the Identifiler™ DNA typing
kit is likely to be a tri-allele pattern as the imbalance peak was consistent
with the singleplex PCR result. The tri-allele should consist of a
homozygote allele peak with an imbalanced third allele.
In conclusion, this singleplex PCR approach with automated allele
assignment allows routine confirmation and resolution of STR allele ambiguities encountered during routine DNA profiling in the laboratory.
B4
The Effects of Different Environmental
Factors on Quantity of DNA Extracted
From Skeletal Remains Recovered From
Gravesites in Former Yugoslavia and
Quality of DNA Typing Results
Arijana Selmanovic, BS*, Ana Milos, BS, Jon M. Davoren, MS,
Tony Donlon, BS, Lejla Smajlovic, BS, Edina Omerovic, Rijad
Konjhodzic, BS, and Jon Sterenberg, MS, International Commission
on Missing Persons, Alipasina 45a, Sarajevo, 71000, Bosnia and
Herzegovina
The goal of this presentation is to present data which will reflect upon
the quality of the obtained STR profiles and the quantity of DNA extracted
from bone samples taken from skeletal remains that were exposed different
environmental influences, and the observed differences between them.
humanity by providing information to persons performing DNA STR
testing of skeletal remains from mass graves.
The International Commission on Missing Persons has been tasked
with the challenge of identifying mortal remains from the armed conflicts
in the former Yugoslavia that occurred in the 1990s. This process is
complicated due to several factors: at least nine years have passed since the
conflicts ended, there are up to 30,000 missing persons in graves scattered
throughout the former Yugoslavia, the conditions of the mortal remains
being recovered, and because DNA testing has become the only reliable
means of identification in the majority of these cases.
In the ICMP’s identification efforts, bodies have been found buried in
mass graves of up to hundreds of bodies. Within the same grave remains
are often exposed to a number of different conditions as some were buried
in body bags, others were wrapped in plastic and some were in direct
contact with either soil or with other bodies. Many sets of mortal remains
have also been burned prior to being placed in the mass graves.
DNA testing of skeletal remains is a rather challenging task because
the DNA in such bone samples is generally highly degraded. In addition,
it is normal that a substantial microbial population infests the bone samples.
The process is further complicated because of the diverse storage conditions in which bodies were placed at time of death. The ICMP has
developed a DNA-led identification process that is successful in obtaining
STR profiles in over 85% of the skeletal cases from the former Yugoslavia.
In order to further optimize this testing process the authors are investigating
the effects of the environmental conditions of the mass graves to see if there
is any link between those conditions and the recovery of DNA from bones.
To determine the effects of environmental factors on the degradation
of DNA, multiple bone samples from two different disposal sites were
examined. The pH values of soil samples from those two gravesites were
measured. Survey data of gravesites was collected with information on
depth and position of bodies within the grave. Factors pertaining to
conditions of bodies such as: whether bodies were burnt, whether plastic
sheeting was used to wrap bodies and whether bodies were buried in body
bags were also noted and considered.
The relative DNA content of bone samples from those specific locations was determined by quantification of DNA extracted using The
Quantifiler™ Human DNA Quantification Kit and ABI Prism® 7000
Sequence Detection System.
STR Typing was performed using the commercially available
Promega PowerPlex® 16 System.
The data presented will reflect upon the quality of the obtained STR
profiles and the quantity of DNA extracted from bone samples taken from
skeletal remains that were exposed different environmental influences, and
the observed differences between them.
DNA, STR, Degradation
STR, Peak Imbalance, PCR
* Presenting Author
33
B5
Developing a Simple Method to Process
Compromised Bone Fragment for
Forensic DNA Isolation
Richard Li, PhD*, Sandra Chapman, MS, and Mary Thompson, BS,
Sam Houston State University, Box 2296, Huntsville, TX 77341; and
Michal Schwartz, BS, Sam Houston State University, Box 2296,
Huntsville, TX 77341
The goal of this presentation is to introduce a new method for
processing compromised bone fragments prior to DNA isolation. The
advantage of this method over conventional methods is in applying the
proteinase solution that will omit the step of a physical cleaning procedure,
such as sanding.
humanity by demonstrating data which suggests that this method could be
used for 1) initial sample preparation for cleaning the outer surface of
compromised human skeletal fragments, and 2) could be adapted for automated DNA isolation for bone fragment in the near future.
Skeletal remains have been challenging biological samples for DNA
isolation. Bones are more difficult for preparing and sampling prior to
DNA extraction. One of the labor-intensive and time-consuming steps in
DNA isolation from bone fragments is the initial cleaning and sampling of
the bone. Due to the potential of having co-mingled remains, adhering
inhibitors and bacterial contamination, the outer surface of the bone
fragment has to be cleaned by a current method like sanding. However, to
avoid cross-contamination between samples, the bone dust that is generated
during the sanding of the bone must be removed. Additionally, safety
protection equipment and procedures are necessary to protect lab workers
and technicians from exposure to blood-borne pathogens.
To address this issue, a simple processing method has been developed
using proteinase solution prior to DNA isolation. In this study, the use of
proteinase solution requires much less labor than a physical method such as
sanding. By incubating with the proteainse solution, the soft tissue and
outer surface of the bone fragment sample is removed. The processed bone
fragment or a portion of the fragment can then be used for DNA isolation.
The characterization of the effect of the proteinases on the cleaning of bone
fragments was performed. Proteinases were screened and the best
candidates were selected. Additionally, the optimum incubation condition
(concentration of proteinase, incubation temperature and pH) for the
proteinase was determined. DNA from processed bone sample was
isolated. The results demonstrated that this method is effective for
removing those soft tissues attached to bone samples and the outer surface
of bone fragment samples. The data suggest that this method could be used
for 1) initial sample preparation for cleaning the outer surface of compromised human skeletal fragments, and 2) could be adapted for automated
DNA isolation for bone fragment in the near future.
Bone, Challenging Samples, DNA Isolation
B6
Investigation of the Performance of the
Promega PowerPlex® 16 System for
Testing of Low Copy Number (LCN)
STR DNA Samples
Lejla Smajlovic, BS, Edina Omerovic, Ana Milos, BS, Arijana
Selmanovic, BS, Jon M. Davoren, MS, Tony Donlon, BS, and Rijad
Konjhodzic, BS, International Commission on Missing Persons, Alipasina
45a, Sarajevo, 71000, Bosnia and Herzegovina
After attending this presentation, attendees will be shown a number of
DNA – STR profiles from the Promega PowerPlex® 16 system during validation of the system for Low Copy Number analysis.
34
humanity by discussing some of the findings associated with low copy
number analysis with the Promega PowerPlex® 16 system.
The International Commission on Missing Persons has setup a DNAled identification system in the former Yugoslavia. The initial phase of the
identification effort utilized short tandem repeat (STR) analysis to match
bone samples with family reference samples. The Promega PowerPlex
16 System (PP16) has been highly successful for testing of bone samples
even 10 – 12 years postmortem. However, for some bone samples the PP16
system was not able to amplify many loci using the standard 32 cycle PCR
protocol. In most of the samples that failed testing using the PP16 system
it has been shown that they contained less than 100 pg of DNA, as analyzed
by the Applied Biosystems Quantifiler system, as well as significant
levels of PCR inhibitors.
A number of studies have shown that increasing the number of PCR
cycles can yield more DNA STR data. With this increase in sensitivity it
has also been shown that there is an increased risk of producing artifactual
peaks, peak imbalances, and there is an increased risk of contamination. As
a first step to try and obtain more STR data from the DNA extracts, with
low levels of DNA recovered, the PP16 system was tested at increased
cycles and optimized for low copy analysis on these extracts.
To study the effects of LCN analysis on the PP16 system various
DNA samples, containing between 20 pg and 500 pg of DNA, were
amplified between 32 and 36 cycles. The effects of the various levels of
DNA were compared for the occurrence of stutters, artifacts, heterozygote
balance and allelic drop out. The results from this study are compared to
previously published data for the PP16 system as well as that of the Applied
Biosystems AmpFlSTR® SGM Plus kit.
LCN, STR, DNA
B7
Optimization of the Promega PowerPlex®
16 System for Testing of Bone Samples
With Low Levels of DNA
Stojko Vidovic, PhD*, Daniel Vanek, PhD, Zoran Obradovic, MD,
Bozana Filipovic, Danijela Music, Jon M. Davoren, MS, and Tony
Donlon, BS, International Commission on Missing Persons, Alipasina
45a, Sarajevo, 71000, Bosnia and Herzegovina
After attending this presentation, attendees will be shown the results
of the optimization of the Promega PowerPlex® 16 system for use on
skeletal samples.
humanity by demonstrating the significant benefit for anyone performing
DNA-STR analysis of bone samples.
The International Commission on Missing Persons has been given the
task of identification of missing persons from throughout the former
Yugoslavia. This identification process is challenging primarily because of
the large number of missing persons, the relatively long length of time that
has passed since persons have gone missing, the lack of medical records,
and the large number of sets of co-mingled remains.
The process of reassembling bodies by DNA STR testing is often
difficult because many of the less dense bones contain much lower levels
of DNA. The low levels of DNA in many bones such as ribs, vertebrae,
and pieces of skull bones makes the STR testing very difficult.
In order to optimize DNA STR testing procedure for bone samples
with relatively little DNA researchers have investigated the effects of
altering a number of parameters in the Promega PowerPlex® 16 system
(PP16). The PP16 system has been optimized by altering the amount of
primers added to the PCR reaction, increased amounts of taq, increasing the
length of the extension cycle and concentration of the final amplified
products.
As the DNA isolated from small amounts of bones is well below the
recommended amount of DNA for the PP16 system all optimizations were
* Presenting Author
validated to ensure that quality of the results. The optimizations of the
PP16 system have been shown to increase the success rate of the testing
from 0% using the PCR protocol in the PP16 manual to 30 – 40% with the
modified protocol.
DNA, STR, PP16
B8
The Relationship Between DNA Quantity
and the Quality of the DNA STR Profile
for DNA Extracted From 10- 13-Year-Old
Bone Samples
Rijad Konjhodzic, BS*, Jon Davoren, MS, Ana Milos, BS, Arijana
Selmanovic, BS, Lejla Smajlovic, BS, Edina Omerovic, Ljiljana
Jukic, BS, and Adnan Rizvic, International Commission on Missing
Persons, Alipasina 45a, Sarajevo, 71000, Bosnia and Herzegovina
After attending this presentation, attendees will be shown results
obtained while working with 10 - 13-year-old bone samples.
humanity by assisting people working on DNA STR analysis of degraded
samples.
The International Organization of Missing Persons (ICMP) has been
tasked with the identification of approximately 30,000 missing persons.
The ICMP identification system has been implemented using
deoxyribonucleic acid simple tandem repeat (DNA STR) testing of family
reference samples and bone samples. To ensure the accuracy of the identification process the minimum acceptable posterior odds for matching of
reference and bone samples has been set at 99.95%. Unfortunately for
many cases there are few family members alive to use as reference samples
and therefore achieving a posterior odds of 99.95% requires a large number
of STRs.
The ICMP uses the Promega PowerPlex® 16 system (PP16) as the
primary kit for STR analysis. With the ICMP’s extraction procedure the
success rate for reporting of 12 or more loci from the first run is
approximately 88%. Unsuccessfully tested samples, however, represent a
large number of missing, due to the fact that the overall number of victims
is so high.
Samples that fail the initial testing are quantified using the Applied
Biosystems Quantifiler™ system. The Quantifiler™ kit uses Real-time
PCR technology to obtain both the amount of DNA present in a sample as
well as to assess the level of inhibition that occurs during the PCR
amplification.
Quantification was performed on 200 DNA extracts that had already
been tested with the PP16 system. For these 200 samples a range of results
were obtained during the PP16 testing. Samples were selected that
amplified no alleles while others were chosen that amplified between 1 and
16 loci. A correlation was made between DNA content of an extract and
the success rate of the STR testing. Samples with fewer than 16 loci
amplified were then retested using adjusted amounts of DNA.
This presentation will discuss the range of DNA quantities calculated
by the Quantifiler™ system and how this information can serve as a means
of improving the success rate of the PP16 testing. It will also show how the
relatively inexpensive Quantifiler™ testing can both reduce the cost and
improve the results of the more expensive STR testing. Ultimately
improving the success rate of the STR testing will increase the number of
cases of which the posterior odds are over 99.95% and therefore can be
identified.
DNA, Real-Time PCR, STR
* Presenting Author
B9
Biological Stains Collected From
Crime Scenes Using FTA® Paper
Luis J. Martinez-Gonzalez, MS, F. Fernandez-Rosado, MS,
Esther Martinez-Espin, MS, J. Carlos Alvarez, PhD, and Carmen
Entrala, PhD, Laboratory of Genetic Identification, Department of Legal
Medicine, University of Granada, Granada, 18012, Spain; José A.
Lorente, MD, PhD*, University of Granada, Department of Legal
Medicine, Faculty of Medicine, Granada, 18002, Spain; and Bruce
Budowle, PhD, FBI Laboratory, FBI Academy, Quantico, VA 22135
After attending this presentation, attendees will learn about the utility
of FTA® paper to recover and store semen and blood stains (from 1 to 10
microliters) from different surfaces (absorbent, non absorbent), as long as
the quantitation and amplification protocols that yield better results with
these stains.
humanity by showing forensics scientists a new approach to recover
biological evidences from crime scenes.
Proper collection and preservation of biological evidence recovered
from the scene of crime is crucial to facilitate the analysis and interpretation
of all analytical results, including DNA typing. FTA® paper is a wellknown and widely use medium to collect and store biological materials
before completing DNA or RNA analysis. Its typical applications are basically focused on the generation of databases (clinical and forensic ones),
although it has also been used for preservation of other biological materials,
as those related to agriculture and forestry.
Among the main advantages of FTA® is its ability to preserve biological materials. When specimens are spotted or applied to the FTA®
matrix cards, cell membranes and organelles are lysed, and the nucleic
acids are released, causing both RNA and DNA to become entrapped in the
fibers of the matrix. Therefore, biological samples such as blood or saliva
can be preserved at room temperature (without further need to cool or
freeze), and to rapidly inactivate organisms including blood borne
pathogens, preventing the growth of bacteria and other microorganisms.
Finally, it is also important to mention that archived samples are ready for
analysis in less than 30 minutes, since the genomic DNA remains bound to
the FTA® paper; this purification process is easily amenable for
automation.
Blood and semen stains ranging between 1 and 10 microliters were
spotted and collected from 5 different surfaces (wood, cotton/clothes, tiles,
glass, and carpet), after 3 different periods of time: one day, one week, and
one month. Two different ways of recovery are being used. The first one
is accomplished by moistening the FTA® paper with sterile distilled water
and then pressing it against the stain. For the second alternative the stain is
moistened with sterile distilled water and then the FTA® paper is applied.
Results show that FTA® paper is an ideal medium to collect dry specimens from hard, non-absorbent surfaces, such as wood, tile and glass. It
is also good medium to collect cells from absorbent surfaces (carpet,
cotton), although the performance depends on the size of the stain (amount
in microliters of biological specimen spotted). The best approach is to first
moisten the sample, and then apply and press with FTA® paper.
From non-absorbent surfaces, positive PCR amplification for
autosomal STRs, Y-chromosome and correct allelic assignation have been
obtained in all cases using as little as 1 microliter of blood or semen. It
should be considered that the volume of 1 microliter used to test FTA®’s
abilities is clearly smaller than most of the samples found at the scene of
crime, where bigger biological stains will be more easily recovered with
FTA®.
Among the advantages -already presented for bloodstains at the last
AAFS meeting- the first one to mention is that this is an easy procedure to
recover samples from the scene, since it is only necessary to add sterile
distilled water into the sample and apply the FTA® paper; second, it is
possible to store samples at room temperature for a long time; third, the
preservation of the original support (the place where the biological fluid
35
was deposited), since there is only a transfer of the cells from, i.e., the
carpet or the wood, into the FTA®. Finally, a fourth advantage worth mentioning is the relative homogeneity in collecting and storing different kind
of samples that could be achieved by using FTA® in a number of cases.
FTA®, Scene of Crime, DNA Analysis
B10
Species Identification of Kachuga tecta
Using the Cytochrome b Gene
James Chun-I Lee, PhD*, Hsing-Mei Hsieh, PhD, Central Police
University, 56 Shu-Jen Rd, Kwei-San Taoyuan, 33334, Taiwan; Li-Hung
Huang, MS, Li-Chin Tsai, PhD, and Yi-Chen Kuo, MS, Department of
Forensic Science, Central Police University, 56 Shu-Jen Road, Kwei-San
Taoyuan, 33334, Taiwan, Republic of China; Adrian Linacre, PhD,
University of Strathclyde, 204 George Street, Glasgow, G1 1XW, United
Kingdom; and Chung-Ting Hsiao, MS, Department of Forensic Science,
Central Police University, 56 Shu-Jen Road, Kwei-San Taoyuan, 33334,
Taiwan, Republic of China
After attending this presentation, attendees will learn species
identification of Kachuga tecta by DNA tchnique using the cytochrome b
gene.
humanity by demonstrating how the Cytochrome b gene is a valuable
genetic marker in the species identification.
A DNA technique has been established for the identification to species
level of tortoises. The test works on the shell of the animal, which is
frequently used in the illegal production of ornaments and preparation,
were used to identify samples from the species Kachuga tecta. A total of
100 tortoise shell specimens collected from the National Council of
Agriculture, Taiwan, were used in this study. Primer pairs were designed
to amplify partial DNA fragments coding for cytochrome b within the mitochondrial genome. The DNA data showed that among the 100 samples
there were four distinct haplotype DNA sequences, within which there
were a total of 90 variable sites. Between haplotypes 1 and 2, there is only
1 nucleotide difference at the nucleotide position 228. Between haplotypes
1 and 3, 64 nucleotide differences were observed; haplotypes 1 and 4, 62
nucleotide differences; and haplotypes 3 and 4, 52 nucleotide differences
were observed. All four haplotypes were compared to the DNA sequences
held at the GenBank and EMBL databases, the most similar species were
Kachuga tecta (haplotype 1 and 2), Morenia ocellata (haplotype 3) and
Geoclemys hamiltonii (haplotype 4), and the highest similarity were 99.5%,
99.3%, 89.9% and 99.5% respectively. However as this was only 89.9%
homologous of haplotype 3 with Morenia ocellata, it would seem that this
haplotype shows only limited homology to a similar species registered currently in these databases. The method established by this study is a further
method for the identification of samples protected under CITES and will
improve the work for the preservation of the endangered species.
Kachuga Tecta, Cytochrome b Gene, DNA Forensics
B11
Evaluation of Commercial DNA
Extraction Kits Using Bacterial Spores
Associated With Problematic Matrices
Matthew J. Ducote, PhD*, and James M. Robertson, PhD, FBI-CTFSRU,
FBI Academy, Building 12, Quantico, VA 22135; and Douglas L. Anders,
PhD, FBI-HMRU, FBI Academy, Laboratory Building, Quantico, VA
22135
After attending this presentation, attendees will retain that commercially available kits can provide high quality DNA from problematic
matrices, including soils, foods, drinks, and plants.
36
Although the kits tested are intended for microbial samples, this
presentation will impact the forensic community and/or humanity by
demonstrating how they can also be applied to situations in which the
extraction of human DNA is required from problematic matrices.
Sensitive and specific PCR-based assays are available for detecting a
variety of pathogenic microorganisms which may be used as bioterror
agents; however, difficulties with these techniques may be encountered if
the organisms are associated with materials such as soils, food and drink
items, and plants. Because of inefficient separation of biological material
from the surrounding matrix, suboptimal cell lysis, and co-purification of
PCR-inhibitory substances along with nucleic acids, traditional laboratory
methods for isolating DNA may prove ineffective for such samples. In
cases where the release of a biological threat agent results in amounts of
potentially hazardous microorganisms higher than those found in the environment, it is essential that high quality DNA can be extracted and used for
PCR-based detection and identification.
Commercially available DNA extraction kits are designed to
efficiently release nucleic acids from bacteria and other cell types typically
found in the soil, as well as to remove or neutralize substances which may
inhibit downstream applications such as PCR. In this study, several kits
have been evaluated with respect to reproducibility and quality of the end
product as obtained from a variety of problematic environmental matrices.
Loam, clay, and sand samples were spiked with Bacillus cereus spores (a
surrogate for B. anthracis), allowed to incubate for various times, and then
subjected to DNA extraction using the kits. The various soil types provided
differing starting amounts of PCR-inhibitory humic and fulvic acids, as
well as different levels of physical attachment of the surrogate cells to the
matrix, and therefore different types of challenges to the materials and
reagents included in each kit. A variety of food and drink items as well as
leaf surfaces were also tested as materials from which to extract bacterial
DNA, and represent examples of other problematic matrices that may be
encountered in forensic scenarios. Real-time PCR amplification of a 145
base pair region from the B. cereus genome was used to determine the
quantity of B. cereus DNA obtained from the spiked samples, as well as the
effectiveness of the various kits at procuring high quality DNA free of PCR
inhibitors.
To optimize the kits for use in the forensic laboratory, the manufacturers’ protocols were modified as necessary, including the addition of an
exogenous reagent that has been shown to effectively remove PCR
inhibitors. The results of this study will be made available to the forensics
community so that researchers and investigators may choose appropriate
methods for isolating nucleic acids from different types of biological
material incorporated into problematic matrices.
DNA Extraction Kits, Bacterial Spores, Problematic Matrices
B12
DNA Detergent: A Novel Technique
to Remove PCR Inhibitors From
Soil-Derived DNA
R. Lazarin, BS, R. Wingo, PhD, T. W. Robison, PhD, J. M. Dunbar, PhD,
and P.C. Stark, PhD, Chemistry Division, Applied Chemical Technology
Group, Los Alamos National Laboratory, MS J964, Los Alamos, NM
87544; James M. Robertson, PhD*, FBI-CTFSRU, FBI Academy,
Building 12, Quantico, VA 22135; and Douglas L. Anders, PhD, and
Rebecca L. Walker, PhD, FBI-HMRU, FBI Academy, Laboratory
Building, Quantico, VA 22135
After attending this presentation, attendees will know that it is possible to remove PCR inhibitors from environmental samples in a one-step
procedure.
humanity by demonstrating a simple procedure was developed for removal
of humic and fulvic acids from forensic samples. Forensic scientists will
be given a protocol that can be used to remove humic acids from environmental samples.
* Presenting Author
Procedures for purification of DNA extracted from bacteria in
environmental samples are time-consuming and require expertise by the
analyst. The extraction procedures must be complex, because environmental
samples are contaminated with humic and fulvic acid substances, which often
co-purify with the DNA. If the humic and fulvic acids are not removed from
the DNA, they will prevent analysis by the PCR because the dissociation and
enzymatic steps are inhibited. In addition, the compounds can influence the
results of down stream procedures that utilize fluorescence detection, such as
real-time PCR. Commercial kits are available for extraction of DNA from
soil samples, but the yield and quality of the DNA is often poor.
An alternative to the commercial kits has been developed that has the
potential to allow a high number of samples to be processed in a day. The
new procedure uses a compound (hereafter referred to as PCR inhibitor
remover, PIR) that is added to the crude extracts to initiate an immediate,
selective reaction with humic acids and other PCR inhibitory materials.
After mixing with the PIR compound, the DNA was precipitated, dissolved
in buffer, and a portion tested in the PCR. To identify effective PIR
compounds, the approach taken was to examine compounds known to be
reactive with carbonyl groups because these moieties are highly present in
humic acids and could act to sequester Mg2+ and form covalent bonds with
primary amines of the polymerase. The PIR compounds were tested on
known humic acid samples for their humic acid-removal capabilities by
both fluorescence spectroscopy and PCR compatibility. A popular
commercial kit was tested with the humic acid-containing samples in parallel experiments, and the results were compared with those obtained with
the PIR compounds.
Thiamine, pyridoxamine (PDA), and phenylthiazolium bromide have
been identified as promising PIR compounds. These compounds out
perform the commercial kit by 10 to 100 fold, improving the PCR
amplification 10-10,000 fold over untreated samples. PDA can alleviate
PCR inhibition at concentrations exceeding natural levels of humic acids
and was selected as the best PIR compound. To utilize PDA in a one-step
reaction, it can be tethered to glass beads. An alternative approach is to use
serial passage through 5mm and 0.2mm pore size filters to remove the
large particles and aggregates of humic acids. A simple protocol will be
presented for PCR-ready DNA from soil extracts using the PIR compound
and filtration. Exploiting the fact that dilution of extracts often mitigates
inhibition effects, it was found that the DNA extract without the PIR
compound required up to a 1:10,000 dilution to obtain strong PCR
products. In contrast, with the PIR compound, the DNA extract required
only a 1:10 dilution to support the PCR. The purification procedure could
be completed in less than 3 minutes.
Soil, Nucleic Acid Purification, Humic Acids
B13
Comparison of DNA Storage Methods
Keri L. Smith*, San Jose State University, One Washington Square, San
Jose, CA 95192; Steven Lee, PhD, San Jose State University, One
Washington Square, San Jose, CA 95192
After attending this presentation, attendees will understand the best
methods of DNA storage.
humanity by enabling the forensic laboratories to store their samples in
such a manner that they are assured that there will be no DNA retention to
the plastic.
DNA storage is a critical issue in forensic, epidemiological, clinical
and genetic database laboratories. 1In forensic DNA laboratories, there is
always the possibility that cases may be re-opened and samples may need
to be re-tested. This is especially important when the amount of DNA is
limited. In addition to sample quantity, intrinsic differences in sample types
resulting in differences in quality, and extrinsic differences in the storage
buffers (e.g., ionic strength), tube surface type, exposure to UV and
temperature of storage may lead to differences in the ability to recover and
re-test the sample.
* Presenting Author
Laboratories utilize different methods to extract DNA depending on
the sample type. The composition of the final solvent in the different
methods and the inherent properties of the casework samples may impart
differences in ionic strength.
Casework DNA samples are usually
dissolved in TE-4 and kept in plastic tubes. The commercial tubes that are
utilized to store the DNA come from different sources and are composed of
different types of plastics.
It has been observed that DNA can bind to polypropylene tube
surfaces and these surfaces cause the DNA to denature.2 Alternate
polymers (polyallomer vs polypropylene) appear to reduce the retention of
DNA.2 Non ionic detergents have been found to be effective in preventing
DNA adhesion at concentrations that do not inhibit PCR.3 In addition some
of the tubes may contain nucleases and chemical contaminants that may
digest and/or denature the DNA.2
In this study, a comparison of storage of DNA samples at varying
concentrations, in different buffers over varying amounts of time, at different temperatures in different tube types, will be performed. Utilization of
the most efficient storage method (buffer, tube, and temperature) may prove
critical in the ability re-test samples.
Inter- and intra-lot tube variation will first be evaluated using control
DNA. Glass tubes will be used as a control. Any variation in storage
temperatures and humidity will be evaluated and monitored using NIST
certified digital thermometers. Tubes containing replicate samples at 0.5,
1.0 and 10ng of DNA in 30ul volume for each time point and each
temperature and each tube type will be stored in the dark and covered in
aluminum foil to avoid exposure to UV.
Samples will be stored at –20°C, 4°C, and room temperature.
Aliquots will be analyzed at the start, 1 day, 1 week, 1 month, 3 months, 6
months and 1 year (a 3 year and 10 year time point set will also be made).
Samples will be in TE storage buffer and Chelex storage buffer.
Quantification will be performed by UV spectrophotometry and a
subset will be analyzed using agarose gel electrophoresis. These values
will be compared to the original sample values to determine if there has
been any loss/retention of the DNA sample based on storage method or
length of time. Data in triplicate for each sample type, storage tube and
temperature will be analyzed for standard deviation and coefficient of
variance. In addition, amplification of STRs from a subset of the samples
will be performed.
References:
1. Steinberg K, et al., “DNA banking for epidemiologic studies: a review
of current practices.” Epidemiology 14, no 2 (2003): 254-5.
2. Gaillard C. and Strauss F. “Eliminating DNA loss and denaturation
during storage in plastic microtubes.” Technical Tips Online (1998)
3. Rensen G. Buoncristiani M. and Orrego C. “Assessment of DNA
retention on plastic surfaces of commercially available microcentrifuge
tubes.” (2002): available from
http://www.promega.com/geneticidproc/ussymp13proc/abstracts/73_buon
cristiani.pdf
DNA, Storage, Polypropylene
B14
Mitochondrial DNA-Based Identification
of Forensically Important Sarcophagidae
and Calliphoridae (Diptera) in Hawaii
Bethany G. Fox*, 373 Awakea Road, Kailua, HI 96734; and Ellen
Shimakawa, PhD, Chaminade University of Honolulu, 3140 Waialae
Avenue, Honolulu, HI 96816
After attending this presentation, attendees will learn about how to
identify different species with mitochondrial DNA sequencing, and how
important this is to forensic entomologist in order to determining the postmortem interval correctly.
humanity by giving them samples of Sarcophagidae and Calliphoridae
37
species from Hawaii. The mitochondrial DNA sequences will help law
enforcement in determining postmortem interval.
The poster will present partial mitochondrial DNA sequence analysis
from DNA isolated from larvae and adult flies of the Sarcophagidae and
Calliphoridae families in Hawaii. The mitochondrial DNA sequences from
Hawaii are similar but not identical to flies from other locations around the
world.
Organic extraction such as CTAB, Pure Gene, and other methods were
used to isolate amplifiable mitochondrial DNA, Centricon YM-100 filters
were used to further purify the template. The Sarcophaga ruficornis DNA
extraction sample contained a concentration of .515 g/ l times 50 l=
25.75 g and the Chrysomya megacephala DNA extraction sample contained a concentration of 1.31 g/ l times 100 l= 131 g. The samples
were diluted down to a concentration of 10ng/ l, and between 30 and 70
ng templates were used in each PCR reaction. The pair of primers used
were TY-J-1460 and CI-N-1840. The Annealing temperature used in the
thermocycler was at a set temperature of 41ºC for 30 complete cycles.
Amplification product was verified by a 1% agarose gel electrophoresis
containing Ethidiumbromide stain, and yields estimated for subsequent
sequencing with the DNA molecular weight marker XIV (100-1500bp).
Amplification was successful in all of the larvae and adult fly samples. The
samples were sent to the Biotechnology Core Facility at the University of
Hawaii in Manoa for sequencing in an Applied Biosystems 377XL DNA
Sequencer. The sequences analysis was based on a region between 400
base pairs of the gene for cytochrome oxidase subunit one (CO1). The
sequences for the Sarcophaga ruficornis and the Chrysomya megacephala
were then compared in an online BLAST search engine of the National
Center for Biotechnology Information’s Genbank. The results from the
sequence comparison for the Chrysomya megacephala in Hawai’i were
similar but not identical to the Chrysomya megacephala from between Lae
and Bulolo, Papua New Guinea (Wells and Sperling, 2000) (Calliphoridae,
GenBank accession AF295551). The results from the sequence comparison for the Sarcophaga ruficornis in Hawaii did not result in a close
sequence similarity with the Sarcophaga ruficornis Genbank entry
(AF259511) but instead it closely resembled a Sarcophaga africa sequence
from Berkeley, California, a related species (Wells, Pape, and Sperling,
2000) (Sarcophagidae, GenBank accession AF259508). The Sarcophaga
ruficornis sequence was also found to be similar to Sarcophaga crassipalpis from Berkeley, California (Wells, Pape, and Sperling 2000)
(Sarcophagidae, GenBank accession AF259510).
The conclusions of this research resulted in isolation of amplifiable
DNA for larvae and adult flies in Hawaii. Mitochondrial DNA sequences
from these species in Hawai’i are similar but not identical to the fly species
from other regions around the world. This research also shows evolutionary
difference between the two specific species in different regions. Being able
to identify the Calliphoridae and Sarcophagidae families more easily will
help the forensic community in determining the postmortem interval in
Hawaii. This work was supported by USDE grant number P217A030070.
Mitochondrial DNA, Sarcophagidae or Calliphoridae, Species
Identification
B15
A Method for Determining
the Age of a Bloodstain
Kristin N. Nestor, BS*, Stacey Anderson, BS, Brandi Howard, BS, Regina
Trott, Gerry Hobbs, and Clifton Bishop, PhD, West Virginia University,
Department of Statistics, PO Box 6057, Morgantown, WV 26506-6057
The goal of this presentation is to show how RNA can also be used in
the forensic community as an indicator for the age of a bloodstain. As a
result, the age of a bloodstain could act as information in relevance to the
time a crime occured. In addition, this information could also be useful for
the exclusion or inclusion of a suspect.
humanity by informing the forensic science community about new research
38
and technology that can be useful in investigations. In addition, this
presentation may bring further interest to this area of study.
DNA allows for the unambiguous identification of the person from
whom a biological sample was derived but provides little information about
when the sample was deposited. This information only indicates that the
biological sample was deposited at the crime scene prior to the collection
of evidence. The ability to determine the age of a biological sample would
greatly benefit the forensic science community, providing a temporal
linkage of biological evidence to the time a crime was committed.
Conversely, if the sample were deposited at a different time, then value
resources might not be wasted pursuing an innocent person. The authors
have used real-time reverse transcriptase PCR (RT-PCR) to show that the
ratio between different types of RNA (mRNA versus rRNA) changes over
time in a linear fashion when dried human blood was examined over the
course of 180 days. One study focused on the comparison of individuals
from three ethnic groupings: European-American, Asian-American, and
African-American. Additional studies demonstrated how environmental
conditions, specifically temperature as well as humidity, changes the rate of
RNA decay. Although other approaches have been used in the past to
estimate the age of a biological sample, this approach offers the following
advantages: enhanced detectability of small samples, simultaneous isolation of DNA and RNA from the same sample, species-specific probes,
and an increased window of usefulness.
Forensics, Real-Time PCR, RNA Decay
B16
Analysis of DNA Mixture Samples:
Integration of the Quantifiler™
Real-Time PCR Kits and the
AmpFlSTR®Yfiler™ Kit
Chien-Wei Chang, PhD*, Julio J. Mulero, PhD, Robert L. Green, BA, and
Lori Hennessy, PhD, Applied Biosystems Inc., 850 Lincoln Centre Drive,
Foster City, CA 94404
After attending this presentation, attendees will that sensitive, reproducible and reliable methods are available to quantify and genotype
mixture DNA samples containing relatively low proportions of male DNA.
humanity by demonstrating advances in mixture DNA sample analysis for
quantitation and STR analysis.
This presentation will discuss the incorporation and utility of the
Quantifiler™ Real-Time PCR Kits and the AmpFlSTR®Yfiler™ Kit into
the analysis of mixture samples typically encountered in forensic casework.
Forensic samples from sexual assault cases frequently contain a
mixture of genotypes in which the DNA of the male contributor, present
only in a very small amount, needs to be discerned from a high background
of female DNA. Physical separation of the two genotypes using the
differential extraction method may sometimes be possible. However, the
technique is laborious, time-consuming and is limited to certain sample
sources. With current autosomal short tandem repeat (STR) typing
systems, male DNA in mixture samples can be correctly interpreted only
when it comprises 5% or more of the DNA in the mixture. Although the
degree of male contribution can be estimated by the analysis of the amelogenin locus or by estimating the quantity of male DNA from the number of
spermatozoa detected, genotyping results of mixture samples may require
a significant degree of interpretive skill from the analyst. With the aim to
improve the ability to obtain useful genotypic information from mixture
samples containing relatively low proportions of male DNA, recent
advances in DNA analysis of forensic samples have focused on developing
sensitive, reproducible and reliable methods to quantify and genotype
mixture DNA samples.
The AmpFlSTR®Yfiler™ PCR Amplification kit is a STR multiplex
assay that co-amplifies 17 Y chromosome STR loci in a single PCR
reaction. The authors have evaluated the efficacy of the
* Presenting Author
AmpFlSTR®Yfiler™ typing system combined with the Quantifiler RealTime PCR Kits to determine the range of ratios of mixture DNA within
which positive detection and accurate genotyping of a minor male
contributor DNA could be obtained. First, mixtures of purified male and
female DNAs were prepared and analyzed with the Quantifiler™ Y and
Quantifiler™ Human assays to determine the relative contributions of male
and total human genomic DNA in samples, respectively. Mixtures with
ratios ranging from 1:1 to 1:8000 (male:female) were then processed with
the AmpFlSTR®Yfiler™ kit. The characteristics of Yfiler profiles
produced from DNA sample mixtures were studied on the basis of specificity, signal quality and intensity. These experiments indicated that full
profiles of minor male contributors were obtained from male-female
mixture samples with ratios up to 1:4000. In contrast, the male components
were not detectable by standard autosomal STR typing methods. The
resulting signal intensity of the Yfiler assays directly correlated with the
concentrations of male DNA determined by the Quantifiler™ Y assays. In
addition, it was shown that the AmpFlSTR®Yfiler™ typing system allows
alleles from multiple male individuals in mixtures sample to be easily
determined in the presence of excess female DNA. Results clearly illustrate that the use of the Quantifiler™ Y Human Male DNA Quantification
Kit in conjunction with the AmpFlSTR®Yfiler™ Kit allows the detection,
quantification and genotype determination of the male DNA component
specifically without interference from female DNA.
Mixture DNA Sample, STR, Y Chromosome
B17
Pitfalls in Crime Scene Investigation:
Report of Four Cases
Francesco Introna, PhD*, Antonio De Donno, MD, Simona Corrado,
MD, and Domenico Urso, MD, Section of Legal Medicine DI.M.I.M.P,
University of Bari, P.zza Giulio Cesare, 11, Bari, 11-70124, Italy
After attending this presentation, attendees will learn about 4 cases of
murder in which avoidable errors committed by the Police scene of crime
officers compromised the final result of the investigations
humanity by showing the importance of the presence of a team of medical
experts in crime scene investigations.
This presentation will describe four cases of murder in which
avoidable errors committed by the Police scene of crime officers compromised the final result of the investigations.
Inspection of the crime scene has a primary role in correct operational
set-up and must be meticulously performed by qualified, specifically
trained staff. Attention must be paid not only to macroscopically evident
signs but also to all elements, however apparently insignificant, present on
the scene.
In the first case (Court of Bari) a child disappeared from the yard of
the apartment block where she lived. Searches were immediately made by
the Police Force and continued, unsuccessfully. The only element neglected
during the analyses was later to prove decisive: the sudden emergence of
flies from a hole in the cellar wall. This had been ignored and the hole
filled. A year later the skeletal remains of a child were found under a thin
layer of gravel in the apartment block cellar. The Pathologist established a
correspondence between the times of disappearance of the child and of
death and deposit in the cellar. However, the advanced stage of decomposition made it impossible to establish by autopsy and laboratory investigations whether prior rape had been committed. The fundamental error in this
case was the incomplete search for the body in the vicinity of the child’s
habitation.
In the second case (Court of Lecce), a Mafia murder and summary
burial of the body (a “lupara bianca” case), the skeletal remains were committed to the Section of Legal Medicine DI.M.I.M.P for investigation after
superficial excavation by the police force of the hole in the ground where
the body had been found. Examination revealed a firearm entrance wound
* Presenting Author
in the skull. No exit wound was apparent, but the bullet had not been
retained in the skull. The authors felt obliged to make a second, meticulous
excavation of the crime scene using metal detectors. This yielded not only
the bullet but also other bone remains that the police officers had failed to
recover. Examination of the bullet resulted in identification of the weapon
from which it had been fired and hence of the murderer. The error lay in
the incomplete excavation of the hole and recovery of the skeletal remains
performed by inexpert staff.
The third case (Court of Lecce) also regarded a Mafia murder and
burial of the body (lupara Bianca), where the confession of a “pentito” (an
erstwhile accomplice) had indicated ritual lapidation as the murder method.
During the excavation operations, carried out by the undertakers, a vast
accidental fracture was caused in the occipital region by a stroke with a
spade. This postmortem lesion allowed the defence to claim that all the
lesions were postmortem and thus to confute the accusation of murder by
lapidation. Close anthropological examination of the injuries then enabled
differentiation between the vital lapidation injuries and the postmortem
lesion caused during recovery. This confirmed the pentito’s confession and
the State Attorney secured a murder sentence. Again the error was in
allowing inexpert staff to excavate the hole and recover the skeletal
remains.
In the last case (Court of Bari), a 7-year-old gypsy disappeared.
Searches by the Police Force, with search dogs (later reported to have antidrugs training), were unsuccessful. The girl was assumed to have been
kidnapped by a rival clan, but not murdered. After about 4 months, a
cadaver in a pre-skeletrization state was found 400 metres from the site of
disappearance, at the edge of a rural road. Investigations confirmed a
correspondence between the times of disappearance and of death. No
objective signs could establish the cause of death or any prior rape, and the
case is still unsolved. The error was in allowing unqualified staff to search
for the body.
In the light of the above cases, the authors emphasize that in crime
scene investigations involving cadavers or biological materials, the
presence of a team of medical experts in criminology, pathology or forensic
anthropology is essential to avoid missing vital clues. Both pathologists
and police officers should therefore be selected from among highly
qualified staff, and should undergo periodic updating courses.
Crime Scene, Investigations, Pitfalls
B18
Education of the Forensic DNA
Analyst in the 21st Century
Joseph E. Warren, BS, MS, PhD*, John V. Planz, BS, MS, PhD, and
Arthur J. Eisenberg, BS, MS, PhD, University of North Texas Health
Science Center, Department of Pathology and Anatomy, 3500 Camp
Bowie Boulevard, Fort Worth, TX 76107
After attending this presentation, attendees will gain knowledge of a
graduate program specilaizing in training forensic DNA analyst and
technical leaders.
humanity by informing the forensic community the existence of this
program and its potential to assist the forensic community in the challenges
of 21st. Century DNA testing. It is hoped that a dialouge will be started
with Laboratory Directors and DNA Technical Leaders as to how the
faculty can further design this program to keep it as relevant as possible in
order to meet the current and future needs in the field.
Accreditation of Forensic DNA testing laboratories has now become
standard in the field. An important aspect of the accreditation process is the
qualifications and training of the DNA analyst. The National Standards has
explicit requirements for coursework and training of DNA analysts and
Technical Leaders. Furthermore, with the advent of new technologies such
as SNP panels, Real-Time PCR, robotic systems, non-human DNA testing,
mitochondrial DNA testing, Y chromosome analysis and Whole Genome
39
Amplification individuals who are trained to understand the science,
research, development and validation of these systems will soon be
required by crime laboratories to implement these technologies. Other
disciplines that are now developing including microbial forensics,
bioterrorism, genomics and bioinformatics in forensic science, will require
individuals with at least some familiarity with these areas.
In 2001, the University of North Texas Health Science Center started
what was at that time, the first graduate program to offer a Master of
Science degree specializing in Forensic Genetics. This program was
developed to provide the forensic community with trained personnel, all of
who meet and exceed the requirements to be DNA Technical Leaders
except for the actual three-year work experience as a DNA analyst in a
forensic laboratory. While that is still the primary focus of the program, it
is also recognized by the faculty that it must keep abreast of new discoveries and technologies available in genetics and identity testing so as to
produce the finest students capable of working in 21st century forensic laboratories.
The program itself is two years in length. The first year consists of
coursework in molecular biology, biochemistry, ethics, biostatistics, a
journal club entitled “Topics in Forensic and Molecular Genetics,”
population genetics, immunology and microbiology. During the summer
of year one the students take two courses, Molecular Methods in Forensic
Genetics and QA/QC for Forensic DNA Laboratories. Second year
coursework includes courses in Biological Evidence Evaluation, Genetic
Data Analysis, Topics in Forensic and Molecular Genetics, Forensic
Anthropology and Expert Testimony in Forensic Science. Four electives
are also offered, Bloodstain Pattern Analysis, Forensic Hair Comparison,
mtDNA Sequencing and Forensic Biology: The History and Science of
Human Identity Testing. The last project the students need to complete is
a 6-8 weeklong internship at a forensic laboratory. They then are required
to present that and publicly defend it as an internship practicum.
This presentation will provide more information as to the coursework,
research projects, job placements and future projects of this unique
program.
DNA, Education, Training
B19
An Evaluation of the Efficacy of a Large
Metropolitan Detective Training Program
in Forensic Biology/DNA Concepts and
Procedures Utilizing a Hierarchical
Formative Evaluation
Garry J. Bombard, MS*, Forensic Institute for Research, Science, and
Training, 3400 West 111th Street, Suite 116, Chicago, IL 60655
The goal of this presentation is to present to the forensic science
community an educational hierarchical formative evaluation model for use
in evaluating forensic biology/DNA training to police detectives/
investigators.
humanity by providing an example of a public policy analysis conducted
by a forensic scientist. The analysis introduces an evaluation model
measuring the effectiveness of a forensic biology/DNA training program to
police detectives. The model can be further utilized to develop and evaluate
the effectiveness of any future forensic science training within the criminal
justice community. The presentation is timely and applicable based upon
several national agendas.
The presentation provides an overview of a public policy analysis.
The public policy analysis is a research study examining the efficacy of a
collaborative forensic biology/DNA training program to the Chicago Police
Department Detective Division. The study establishes a unique model of
evaluation derived from the educational field. The study is timely in developing forensic science training programs to criminal justice agencies and
40
mirrors the national agenda for the development and monitoring of training
programs.
The specific focus is to determine the efficacy of training, evaluating
knowledge and understanding of forensic biology/DNA concepts and
procedures, of a forensic biology/DNA training program previously presented by the Illinois State Police Forensic Science Center at Chicago to the
Chicago Police Department Detectives. The study evaluates the retention
of information by the training attendees, the ability to utilize the information, and identifies future training needs of the Chicago Police
Department Detective personnel.
The study develops a model to measure the efficacy of the collaborative training program. The researcher utilizes an educational model, a
hierarchical formative evaluation, proposed in 1993. The hierarchical formative evaluation is further developed and operationalized by incorporating a widely accepted educational taxonomy on cognitive thinking skill
levels. The resulting evaluation model is a unique approach to measure the
efficacy of training at several different levels. The final evaluation model
is unique. No published literature documents the incorporation of this
taxonomy into the formative evaluation model.
A self-administered survey instrument is the primary data source. The
survey instrument (questionnaire) was developed from material presented in
the collaborative training program. The questionnaire measures the cognitive
thinking skill levels for achievement of the material delivered during training.
From a local perspective, the benefits of the study determine the
current understanding of forensic biology/DNA within the Chicago Police
Department Detective Division. The study also determines if the training
received from the Illinois State Police was effective and identifies additional specific topic related training. In addition, suggestions for
changes/modifications to the current program for new detective classes are
recommended.
From a national perspective, the research is applicable to other entities
within the criminal justice system and other complex systems/organizations. To date, very little emphasis has been placed on the development of
training in forensic sciences for police detectives. This lack of training and
emphasis in forensic science has been identified through national surveys
and studies on police detective training. Currently, there is the start of a
national effort, the “Improving Justice Through DNA Initiative,” to develop
formal forensic science training programs for all elements of the criminal
justice community.
Additionally, the research will validate the collaborative training
model. The collaborative approach to the development of the training is
new to the law enforcement community. The collaborative model demonstrates a successful method to accomplish forensic science education in
detective training in the future. This research on the development of the
hierarchical formative evaluation model and confirmation of the collaborative training model will significantly contribute to the national agenda.
Lastly, the National Institute of Justice (NIJ) is developing a model to
measure the effectiveness of training. The evaluation of training will be
mandatory for any training project utilizing grant money. The model presented accomplishes this future requirement.
Forensic Biology/DNA Training for Detectives/Investigators, Public
Policy Analysis, Hierarchical Formative Evaluation
B20
Microspectral Analysis of Gemstones
and the Applications to Forensic Science
Paul Martin, PhD*, CRAIC Technologies, 2400 North Lincoln Avenue,
Altadena, CA 91001
After attending this presentation, attendees will learn the techniques
used to prepare and analyze gemstones and to understand and interpret the
spectral data.
Since gemstones are often stolen, this presentation will impact the
forensic community and/or humanity by giving the forensic community the
* Presenting Author
skills to identify and characterize gemstones as criminalists comes across
them in their work.
The theft of gemstones has occurred since time immemorial and has
become quite romanticized. The topic has been the subject of literature and
film from “Le Count du Monte Cristo” to “The Pink Panther.” Yet the theft
of gemstones is quite a real issue and there are real problem in identifying
gems. In addition, because of their value, gems are often counterfeited with
less precious materials. It is important for the forensic scientist to be able
to confirm the identity of precious stones and their less precious substitutes.
The purpose of this paper is to show the techniques used for the
forensic analysis of gemstones by UV-visible-NIR microspectroscopy and
microfluorometry. These techniques include sample preparation, methods
of spectral data acquisition and, of course, spectral analysis and interpretation. The talk will also review the data from several types of gemstones
in order to aid the examiner in identifying them in casework.
mixed with anticoagulant was also spilled. Automatic hourly recordings
of temperature, windspeed and precipitation were obtained for the area
during the entire study period. The areas of spilled blood were monitored
daily while blood was visible with the naked eye. Thereafter selected areas
within the areas where the blood was spilled, were sprayed weekly with
luminol and the luminesence documented. Planned study period is 18
months. For an extended time frame, a homicide scene where blood was
known to have been spilled in a lava field 18 months previously was
revisited with luminol at the onset of the study.
Results of this study will show the usefulness of applying luminol at
outdoor crime scenes to detect diluted blood, will discuss the different
results on different types of soil and discuss how it may aid the crime scene
investigator in his/her homicide investigation.
Luminol, Outdoor Crime Scene, Criminalistics
Microspectrophotometer, Gemstones, UV-Visible-NIR
B22
B21
The Outdoor Crime Scene: Influence of
Weather and Soil Types on the Detection
of Diluted Blood With Luminol
Thora S. Steffensen, MD*, University Hospital of Iceland, Department of
Pathology, Rannsoknastofa H.I. vid Baronsstig, Reykjavik, IS 108,
Iceland; and Omar Palmason, Reykjavik Police Department, Hverfisgata
115, Reykjavik, IS 108, Iceland
The goal of this presentation is to demonstrate to the forensic
community the usefulness of luminol application at outdoor crime scenes,
months and even years after blood was spilled.
humanity by showing the usefulness of applying luminol at outdoor crime
scenes to detect diluted blood, will discuss the different results on different
types of soil and discuss how it may aid the crime scene investigator in
his/her homicide investigation.
Traditionally luminol has been used as a presumptive reagent to detect
blood, both fresh and old. Luminol is capable of detecting blood in dilution
up to 1:5.000.000 and it´s usefulness at indoor crime scenes is well known
and well documented.
Due to the effect of rain or snow, visible blood may quickly disappear
at an outdoor crime scene. Little has been documented on the use of
luminol to detect diluted blood in outdoor conditions although homicides
committed outdoors are not uncommon.
This presentation will describe a study performed to investigate the
time period that luminol can detect diluted blood outdoors, in exposed areas
and to investigate if the type of soil that blood is spilled on, affects the
length of time that luminol can detect spilled blood outside. The study was
also designed to investigate the possible difference in detection of diluted
blood with luminol, between blood spilled in the summer, when the ground
is dry, and blood spilled in the winther, when the ground is wet or snow
covered. Possible difference in the behavior of human versus pig blood and
human blood with and without an added anticoagulant was also investigated for research purposes.
A remote rural area with restricted access was chosen for the site of
study. The area contained a green area, with both grass and moss, gravel,
mixed with sand, and rocks. On the green area as well as the gravel and
rock, selected volumes of human blood (obtained from live volunteers) was
spilled. The volume ranged from 5ml-1000ml, to simulate anything from
insignificant bleeding to a life threatening blood loss. Blood was spilled
according to a protocol in the month of August, under sunny and dry conditions, and in February, on top of snow, while raining. As human blood in
large volumes is difficult to obtain, a parallell study was run using pig blood
for comparison to see if pig blood might be substituted for human blood in
further such outdoor studies. Both the human and pig blood was without
anticoagulant. For further comparison, a large volume of human blood
* Presenting Author
Fulfilling the Role of the Forensic Scientist:
The New Orleans Police Department as
a Case Study and Argument for Greater
Emphasis on Actualized Science
Anna S. Duggar, MS*, and Rose R. Duryea, MA, New Orleans Police
Department Crime Laboratory, 2932 Tulane Avenue, New Orleans,
LA 70119
After attending this presentation, attendees will learn the emphasis of
active casework and interagency communication over the strict revalidation of accepted techniques. Practical examples from the working
New Orleans Police Department structure will be provided as a starting
point for efforts in the attendee’s lab or law enforcement agency.
Most public sector forensic scientists have to face the choice of
research and validation versus casework and communication. Using the
NOPD as a model, this presentation will demonstrate the need for scientifically trained personnel to move from the academic emphasis on completeness to the more flexible “triage” emphasis on responsiveness and
inter/intra-agency communication. This presentation will impact the
forensic community and/or humanity by serving to provide examples of
creative solutions to the conflict, and to contining the current discussion of
the role of the forensic scientist in criminal investigations.
Forensic science is defined as the application of science to questions
of law and is, by nature, an applied science, implemented without the
benefit of the controlled conditions present in more traditional sciences.
Recent accreditation, validation, and quality assurance/quality control
efforts aim to regulate science to prevent the acquisition of false data and
to make results more reproducible. But this inherently desirable process
can go too far if insistence on formal validation protocols in applied
forensic labs creates an impediment to a laboratory’s expansion of its capabilities or its ability to meet the needs of the law enforcement community.
With the challenges of understaffing and underfunding facing many applied
forensic labs, most forensic scientists have to face the choice of research
and validation or casework and communication.
At the 2004 meeting of the American Academy of Forensic Sciences,
a series of presentations in the Criminalistics section addressed the
involvement of the forensic scientist at the crime scene and in criminal
investigations. Widespread agreement exists that scientists in forensic
science must be involved, as non-scientists cannot be expected to produce
skillful applications of the scientific method to applied casework. As with
any science, experimentation leading to expansion of capabilities and new
technologies is vital. Forensic science has an impressive cadre of
researchers whose full-time mission is the dissemination of improved technology to the practitioners in the field. But the practitioners have their own
challenges to meet: timely casework results—in not only an adjudicative
role, but in the underutilized investigative mode—and inter-agency communication must be paramount for the applied forensic scientist to fulfill
41
his or her function. Cumbersome validation studies that prevent or delay
the usage of generally accepted techniques can be a significant hindrance
to job performance.
The New Orleans Police Department is a working model demonstrating the vital need for scientifically trained personnel to move from the
academic emphasis on completeness to the more flexible “triage” emphasis
on responsiveness and communication. Criminalists at the NOPD Crime
Lab have faced the considerable caseload of any forensic scientist in a large
city, compounded with drastically low wages and a malnourished laboratory budget. In a situation where responsive casework management,
investigative involvement of forensic professionals, and better interagency
communication are balanced against the forensic community’s demand for
in-house validation and classic structure, it rapidly becomes clear that more
creative approaches are necessary.
For example, in response to the identification of a lack of communication between branches of law enforcement in New Orleans as one of the
primary obstacles facing crimefighting efforts in the city, district attorneys
have been invited to COMSTAT meetings, while homicide detectives sit in
on the DA’s weekly strategy sessions. Additionally, the constant need for
low turnaround times on priority cases has prompted the metamorphosis of
the Forensic Light Unit (FLU), a two-man on-call unit, from a reactive
latent print unit into a proactive investigative response unit. New techniques are responsibly and effectively put into practice by FLU with appropriate QA/QC protocols, but the predominant emphasis in this new model
is the direct application of scientific expertise to questions of law provided
by investigators and attorneys, and the conscious commitment of time and
energy to maintaining open lines of communication. The success of this
new emphasis is evident in both anecdotal and quantifiable levels of satisfaction among investigators.
In applying creative problem solving to overwhelming demands on
time and resources, the department has definitively demonstrated, as
prominent members of the field have suggested, that “doing the job right
cannot supplant doing the right job.”
The presentation will highlight variations of the typically encountered
types of trace evidence that may have greater value given special circumstances and assist in an investigation of an unknown perpetrator or illustrate
association with the incident due to the presence of material or form or
condition of the samples. Examples to be presented include evidence
deposited in bloodstains, beaded spray paint microscopically identified on
a roll of duct tape left at the scene which led to a subject, bloodstain patterns of the impression of the weapon (a table steak knife that had been
cleaned and returned to a drawer in the kitchen) that demonstrated a
garment worn by one of the victims, microscopic examination of a human
hair wig used to disguise a perpetrator that led to finding that some
imported are made from cadaver hair, the tire and partial license plate
impression in snow at the scene of a multiple homicide and variations of
fabric damage including an example that helped to substantiate statements
of the victim in an acquaintance sexual assault.
This presentation will also include some unusual types of trace
evidence. Examples include botanical samples such as thorns in a subject’s
clothing that were found to be consistent with thorns from a rose bush
damaged by the perpetrator who jumped from a second floor window to
escape from the scene, sequential layers of material deposited in hollow
point projectiles, welding spheres microscopically identified from the
debris on the clothing of an 8-year-old kidnapping victim, and air bag evidence such as makeup, fiber samples and starch granules that may assist in
determining the driver of a vehicle involved in a fatal accident. If you do,
you could say that provided information linking the items to the airbag.
The author gratefully acknowledges the permission of Glenn Schubert
and the Illinois State Police for permitting the inclusion of photos related to
air bag evidence in this presentation.
In summary, it should be emphasized that the use of trace evidence as
an additional investigative tool may solidify the findings in any given case.
Forensic Science, Validation, Communication
B24
B23
The Value of Trace Evidence
as an Investigative Tool
G.M. Yezzo, BS*, Ohio BCI&I, 1560 State Route 56, PO Box 365,
London, OH 43140
The goal of this presentation is to provide some case examples of
unexpected circumstances or forms of trace evidence that have provided
assistance in an investigation.
humanity by serving as a reminder of some of the uses of trace evidence as
an additional investigative tool that may solidify the findings in case.
DNA analyses alone may not resolve all cases that include biological
evidence such as semen or blood. Even in cases where these materials are
present, depending upon the case facts, trace evidence may assist substantially in the investigation.
Most forms of Trace evidence provide only class or comparative
information. However, the microscope may be used to identify particles
that provide important investigative information. Many of the types of
materials discussed in this presentation are documented in available references on trace evidence such as Volumes of The Particle Atlas (McCrone
and Delly (1973) and McCrone, Delly and Palenik (1979)), Color Atlas
and Manual of Microscopy for Criminalists, Chemists and Conservators
(Petraco and Kubic, 2004), Mute Witnesses –Trace Evidence Analysis
(Houck, 2001) and Trace Evidence Analysis (Houck, 2003). Taking
advantage of the trace evidence may provide crucial investigative information or establish a link between individuals or an individual and a
location. The goal of this presentation is to provide some case examples of
unexpected circumstances or forms of Trace evidence that have provided
assistance in an investigation.
42
Trace Evidence, Investigative Information, Criminalistics
Forensic Intelligence - Forensic Science
Beyond the Courtroom
Rebecca Bucht, BSc*, 309 West 76th Street, #4A, New York, NY 10023;
and Oliver Ribaux, PhD, Université de Lausanne, Ecole des Sciences
Criminelles, Lausanne-Dorigny, BCH, 1015, Switzerland
The goal of this presentation is to introduce a framework for integrating
forensic evidence into the criminal investigation and intelligence analysis
processes, complete with examples of real life applications and results.
humanity by demonstrating how the development of forensic intelligence
can improve knowledge of criminal mechanisms through the exploitation
of a solid set of real-time data at a tactical, operational and strategic level.
Despite evidence of the benefits of applications of forensic case data
to the investigative and intelligence world, research and implementation of
forensic science continues to focus primarily on its function as proof in
courts of law. This not only deprives said investigative and intelligence
applications from an added information source, it also renders a huge
wealth of forensic information unexploited.
Forensic intelligence is in essence the product of logically processing
forensic case data. Although the concept of collecting and processing
forensic data is by no means novel, modern technology provides databases
capable of storing, handling and sorting large amounts of increasingly
complex data, allowing these old concepts to be realized more effectively
and on a larger scale.
The basic inferences made from forensic data include identifying
recidivists, individualizing a source based on a trace, individualizing a trace
based on a source, linking cases by trace-trace comparisons, profiling of the
source of a trace, classifying the source of a trace, listing possible sources
of a trace and listing possible relatives of the source of a trace. These inferences are made based on physical and chemical characteristics of samples
and standards.
* Presenting Author
Fingerprint and DNA databases are two examples of where forensic
information is used in a wider context, whether it is to identify recidivists,
individualize a source based on a trace, individualize a trace based on a
source, or link cases. Other forms of traces such as shoeprints, tool marks,
and glove prints are less systematically exploited. These traces are
abundant on crime scenes, less expensive to process, and can provide
significant information. Even though a particular trace cannot necessarily
provide a conclusive enough inference to be used as evidence in a court of
law, the information it can provide can be indispensable in an intelligence
setting.
The forensic science community should be more aware of the importance of extending the impact of forensic science beyond the courtroom.
Similarly the intelligence community needs to be aware of the kind of
information forensic science can provide. Effort also needs to be made to
ensure functional channels of communication exist between forensic
scientists and investigators, intelligence analysts and other professionals in
order to ensure that the forensic case data is properly understood and
contextualized.
For example, in the case of illicit drug profiling, the chemical data is
first interpreted by forensic scientists in order to evaluate links between
seizures. This linkage information is then passed on to investigators, and
further to criminologists and geo-politicians, who all may be able to
combine the forensic data with the data they already base their investigations on.
There are many potential benefits in expanding the use of forensic
science data in investigative and intelligence scenarios. The input and
cooperation of the forensic science community is needed in order to assure
a successful integration.
Forensic Intelligence, Intelligence Aanalysis, Linkage Blindness
B25
1,2-Indanedione: Is it a Useful
Fingerprint Reagent?
Chris Lennard, PhD*, Australian Federal Police, Forensic Services,
GPO Box 401, Canberra, ACT 2601, Australia; Christie WallaceKunkel, BSc, and Claude Roux, PhD, University of Technology, Sydney,
Centre for Forensic Science, PO Box 123, Broadway, NSW 2007,
Australia; and Milutin Stoilovic, MSc, Australian Federal Police,
Forensic Services, GPO Box 401, Canberra, ACT 2601, Australia
of the fingerprint reagent 1,2-indanedione: its strengths, weaknesses and
the inconsistencies reported over the last 8 years in terms of its value as a
fingerprint reagent. Recommendations will be made based on the results
of the research performed.
humanity by the presentation of the results of this research which will
contribute to the body of information already available on the value of
1,2-indanedione as a fingerprint reagent. Conflicting results have been
reported to date. This study, under Australian conditions, indicates that
1,2-indanedione is a viable alternative to ninhydrin and DFO for latent
fingermark detection on porous surfaces.
Ninhydrin is the accepted, routine reagent for the chemical detection
of latent fingermarks on porous surfaces such as paper. Ninhydrin reacts
with the amino acid component of the latent fingerprint deposit to produce
a dark purple product known as Ruhemann’s purple. Secondary treatment
of a ninhydrin-developed mark with a zinc or cadmium metal salt produces
a coordination complex that is luminescent under certain conditions.
Significant enhancement is possible in the luminescence mode. Numerous
research projects have been undertaken since the early 1980s to find
ninhydrin analogues that offer advantages over ninhydrin itself.
In 1995, whilst researching ninhydrin analogues, Jouillé and coworkers, in conjunction with the U.S. Secret Service, synthesised a new
type of latent fingerprint visualising agent, 1,2-indanedione (Ramatowski,
* Presenting Author
1997). Since then, researchers around the world have conducted research
into the capabilities of 1,2-indanedione as a fingerprint reagent. The results
have been varied, with conflicting results and different recommendations
made.
A critical review of the literature regarding 1,2-indanedione was
performed. A number of discrepancies exist in the literature as to which
formulation and which development procedure produces optimal results.
As a result, this project set out to determine the best formulation and development procedure under Australian conditions, encompassing all published
recommendations as well as some novel approaches. 1,2-Indanedione formulations were compared with respect to initial color, luminescence,
concentration of reagent, acid concentration, and the effect of different
carrier solvents.
Numerous development conditions were investigated, including a
conventional oven, a heat press, humidity, metal salt treatment and liquid
nitrogen. A heat press set at 165º C for 10 seconds proved to give the best
initial color and the highest luminescence. Secondary metal salt treatment
improved initial color and luminescence. The Polilight (Rofin), the VSC2000 (Foster & Freeman), and the Condor Chemical Imaging Macroscope
(ChemImage Corp) were used to detect the fingerprints developed with
1,2-indanedione on a variety of high- and low-quality porous surfaces.
Overall, very good results were obtained.
The optimum formulation for 1,2-indanedione was found to be a 1%
(w/v) solution using HFE 7100 as the carrier solvent. 1,2-Indanedione
treated fingermarks were best developed using a heat press set at 165º C for
10 seconds, after which they display a bright pink initial color and a high
degree of luminescence at room temperature.
Field tests were also conducted to compare 1,2-indanedione with DFO
and ninhydrin, showing that 1,2-indanedione develops more fingerprints
than the conventional reagents and thus should be considered as a viable
alternative for the development of fingerprints on porous surfaces. It is
obvious that 1,2-indanedione, as a fingerprint technique, is very much
dependant on environmental conditions, reagent formulation, and development conditions for optimum results to be obtained. It is for this reason
that different research groups around the world have had varying results
with respect to the application of this reagent.
It has been well established that ninhydrin reacts with amino acids to
form Ruhemann’s purple. Very little information on the chemistry of 1,2indanedione exists in the literature and the product formed upon reaction
with amino acids has not been confirmed to date. The current research aims
to characterize the reaction product using fluorescence spectroscopy,
infrared spectroscopy, UV-visible spectroscopy, mass spectroscopy, and
nuclear magnetic resonance spectroscopy.
Latent Fingermarks, Porous Surfaces, 1,2-Indanedione
B26
The Billiard Ball Ricochet Effect and
the Garment as an Intermediate Target
H. Bulent Uner, PhD*, Istanbul University, The Institute of Forensic
Sciences, I.U. Adli Tip Enstitusu Cerrahpasa, Istanbul, 34303, Turkey;
and Ismail Cakir, PhD, Council of Forensic Medicine, Minisrty of Turkey,
Adli Tip Kurumu Esekapi Cerrahpasa, Istanbul, 34246, Turkey
After attending this presentation, attendees will learn the importance
of billiard ball effect while determining firing distance.
humanity by demonstrating the importance of billiard ball effect while
determining firing distance.
From the area of dispersed pellets on the target, a rough estimation of
range of fire can be made. There are many factors that affect the dispersion
of the pellets like length and diameter of the barrel, size of the pellets,
degree of the choke, etc.
If a shotgun is fired in contact with a body or at close range, pellets hit
the body en masse and are scattered a wide area within the body. This
43
ricochet phenomenon has been termed ‘the billiard ball ricochet effect’.
Also, this phenomenon can occur when pellets hit the clothing en masse.
This intermediate target will cause an increase in dispersion of the shot. The
thickness of the clothing, the nature of the fabric and the number of layers
of the garment can alter this dispersion of the shot.
In determining the range of fire in decomposed and burned bodies
where the skin pattern cannot be seen, x-rays revealing shot patterns may
be of considerable assistance. However caution is necessary. In these
cases, the billiard ball ricochet effect may lead to erroneous conclusions
about the range of fire because of the opinion is formed on basis of the
pattern of the pellets on x-rays. Wide dispersion of the shots seen on the
x-rays may lead to conclusion of a great range of fire than actually occurred
The cases presented are good examples of the billiard ball ricochet
effect with intermediate targets. In the first case a woman had a contact
shotgun wound of the abdomen. On the x-rays, widespread scatter of
pellets were seen within the body. In the second case, although the pellets
hit the clothing en masse, the size of shot pattern on the body was over a
large area.
Shotgun, Pellet Distribution, Billiard Ball Ricochet Effect,
Range of Fire
B27
Who Shot Muhamed Jamal Al-Dura?
Is the Boy Still Alive?
Maurice Rogev, MB ChB, 11 Zamenhof Street, Tel-Aviv, 64373, Israel;
and Nahum Shahaf, Msc*, Natop, Habiluim st 3, Ramat-Gan, 52297,
Israel
After attending this presentation, attendees will understand the need to
be cautious with media reports unless it’s based on accepted forensic
science criteria.
humanity by demonstrating the inaccurate impression created by the media
in their description of the A-Dura episode on the second day of the
Palestinian Intifada, emphasises the need for caution in interpreting critical
Death news reports published by the media unless its based on accepted
forensic science criteria.
Details of the Incident: On September 30, 2000, the second day of
the Intifada a crowd of Palestinian policemen and civilians, some armed,
attacked repeatedly an isolated Israel Defence Force (IDF) outpost situated
at a road junction near Netzarim, an Israeli village in Gaza.
French and other television groups televised the incident. The event
developed initially as a demonstration and turned violent when Palestinian
policemen began to shoot at IDF soldiers in the outpost. French television
showed a father and his son Muhammed al-Dura hiding behind a concrete
barrel. The 12-year-old boy seemed to be killed and his father seemed to
be wounded. The French television alleged that A-Dura was killed by IDF
fire. The IDF soldiers claimed that they did not see the pair crouched
behind the barrel and they didn’t shoot at them.
The pictures of the event were shown all over the world and
Muhammad a-Dura became the symbol of the Palestinian intifada.
Methodology: No autopsy examination of the body was made by the
Palestinians, there are no accurate details of any wounds that may have
been caused by the gunfire. The body was not identified according to
accepted standards and recognized practices. The identity of the body
cannot therefore be accepted as that of Mohammed a-Dura the boy A-Dura
was clearly not killed by IDF fire.
Aerial photographs were taken of the scene that showed the crossroad
and the position of the Israeli Defence Force (IDF) outpost. Television
footage of scenes of the riot, the boy cowering with his father and of the
funeral procession were examined as well as medical notes and still photographs of the boy lying on a mortuary slab.
44
The aerial photographs showed the crossroad, the wall and concrete
barrel behind which the boy and his father had hidden, the IDF outpost and
the Palestinian outpost called the “Pita” across the road opposite the wall.
As the original wall had been destroyed for security reasons, a reconstruction of the immediate area of the wall and the barrel of concrete was
made. The barrel had the same diameter of the barrel involved in the
incident. Geometric and ballistic criteria were used in the reconstruction
The same type of rifles used by the IDF soldiers and the Palestinians
were fired directed towards the barrel and the wall at an angle of the alleged
fire from the IDF outpost, the “Pita” and from other angles. The television
footage and still photographs of the incident and the still photographs of the
body were also studied. Medical reports by a Palestinian doctor describing
the injuries found on the body were studied in the absence of a complete
autopsy protocol. No spent bullets or cartridge cases were available for
Ballistic examination.
Results and Conclusions:
1. The geometrical and ballistic findings show that the boy was
protected from the direction of the Israeli outpost.
2. The spread of the particles of stone caused by the impact of the
two bullets next to the boy’s head proves that the fire came from
a less oblique direction, consistent with the Palestinian position
(named “Pita”).
3. The position of the Palestinians relative to the Israeli outpost
raises the possibility that the shooting was deliberate.
4. Part of the bullet holes in the wall were made later artificially.
5. Long cut on the body of the boy described by one of the doctors
fit a knife rather than a bullet.
6. The evidence of the doctors shown in the television and in
telephone conversations is not consistent with the signs of injury
in the photographs of the boy alleged to be that of Mohammed
A-Dura in the hospital. This raises the suspicion that this is not
the boy A-Dura.
7. According to the evidence of the doctors at the hospital the body
of the boy a-Dura reached the hospital some hours before the
time of the incident started. Therefore the dead boy presented in
the hospital as Muhammad a-Dura cannot be the boy from the
Netzarim junction.
8. The signs of injury on the boy’s body at Netzarim were not con
sistent with fresh blood.
9. Many manufactured incidents were revealed in the television
pictures. These included gunfights in front of the cameras in
areas that were hidden from the IDF outpost.
The all event around Mohammed al-Dura including many other
events seems to be created, including the death of the boy named
Muhammad al-Dura.
Media Reports, Al-Dura, Forensic Criteria
B28
Uncertainty in the Estimated Angles of
Impact of Freely Falling Blood Drops
Jon A. McGuire, MFS, and Walter F. Rowe, PhD*, Department of Forensic
Sciences, The George Washington University, Washington, DC 20052
After attending this presentation, attendees will learn how to
determine the confidence limits for the calculated angle of impact of a
falling blood drop with a target surface. This preseantation will outline the
relevant experimental data for a particular target surface and the statistical
treatment of this data.
humanity by demonstrating that the uncertainties in the calculated angles of
impact of blood drops with target surfaces are considerably smaller than
standard texts on bloodstain pattern analysis claim.
* Presenting Author
The goal of this presentation is to provide crime reconstructionists
with a validation of the Balthazard formula for the calculation of the angle
of impact of a blood drop with a target surface. This presentation also will
also provide estimates for the uncertainty in a calculated angle of impact for
ranges of impact ranging from 10 to 90 degrees.
Crime scene reconstructionists and bloodstain pattern analysts
frequently use the Balthazard formula for calculating the angle of impact of
a freely falling blood drop with a target surface from the dimensions of the
resulting blood spot. Blood drops impacting a flat surface at an angle 0
produce an elongated blood spot having length L and width W. The angle
0 is then given by the equation:
Approximate Angle
of Impact
90
80
70
60
50
40
30
20
10
0 = arcsin (W/L)
In 1993 the U.S. Supreme Court set out a number of criteria for the
admission of scientific evidence; among them is the known or potential
error of a scientific technique. Books on bloodstain pattern analysis rarely
discuss the uncertainties in the calculated angle of impact. Bevel and
Gardner’s widely used text Bloodstain Pattern Analysis suggests that the
calculated angles are accurate to within five to seven degrees.
This research was undertaken to determine the 95 and 99% confidence limits for the estimated angles of impact of blood drops. Fifteen
microliter drops of human blood were allowed to fall ten and thirty-six
inches onto the uncoated surface of white poster board with impact angles
of approximately 10, 20, 30, 40, 50, 60, 70, 80 and 90 degrees. Fifteen
drops of blood were dropped at each angle of impact and each distance of
fall. Fifteen microliters was found to be the smallest volume of blood that
would fall freely from the disposable tip of a Pipetman pipetter. Two different distances of fall were used to determine if the estimated angles of
impact showed any dependence on the distance of fall. Theoretically there
should be no such dependence. The untreated surface of the white poster
board was chosen as the target surface to reduce the flow of the blood drops
after impact. The target surface was held in a homemade device made from
Plexiglas and wooden dowel rods. Slots were cut in the Plexiglas at angles
ranging from 10 degrees to 90 degrees; the angles of the slots were measured after they were cut. The lengths and widths of the blood spots were
measured with a Cen-Tech 4 inch digital caliper. Three of the blood spots
produced at an angle of impact of 80 degrees and a thirty-six inch distance
of fall were discarded because their widths were greater than their lengths.
The measured lengths and widths of the blood spots were used to calculate
the angle of impact using the Balthazard formula. The means and standard
deviations of the calculated angles of impact were determined for each
angle of impact and each distance of fall.
Analysis of variance (ANOVA) was performed on the calculated
angles of impact. For a ten inch distance of fall an F value of 1187 was
obtained, while for a thirty-six inch distance of fall an F value of 1288 was
obtained. These results show that the Balthazard formula is statistically
significant at the 99.5% level. More importantly, because these two F
values exceed the critical F values for the 99.5% confidence level by more
than a factor of four, the Balthazard formula is shown to be a satisfactory
predictive tool.
The standard deviation of the calculated angle of impact was found to
increase with the angle of impact, in agreement with previously published
work. The confidence range (the difference between the upper and lower
confidence limits) for the calculated angles of impact were determined at
the 99% confidence level using:
where t is Student’s t, s is the standard deviation and n is the number of data
points used to calculate s. The table below shows the confidence ranges for
the angles of impact from 10 to 90 degrees for both distances of fall.
* Presenting Author
Distance of
Fall = 10 Inches
6.410283
11.2365
3.365768
2.463193
2.148248
1.686314
1.136359
0.795556
1.46632
Distance of
Fall = 36 Inches
8.255688
7.701132
4.722746
2.667552
1.754003
2.435882
1.993076
1.59836
0.710401
Up to an angle of impact of 60 degrees the uncertainty in the calculated angle of impact is less than 3 degrees, substantially better than the
uncertainty claimed by Bevel and Gardner.
Bloodstain Pattern Analysis, Crime Scene Reconstruction,
Criminalistics
B29
The Detection and Enhancement of
Latent Fingermarks Using Infrared
Chemical Imaging
Mark Tahtouh, BSc, University of Technology, Sydney, Centre for
Forensic Science, PO Box 123, Broadway, NSW 2007, Australia;
Chris Lennard, PhD*, Australian Federal Police, Forensic Services,
GPO Box 401, Canberra, ACT 2601, Australia; and John Kalman, PhD,
Claude Roux, PhD, and Brian Reedy, PhD, University of Technology,
Sydney, Centre for Forensic Science, PO Box 123, Broadway, NSW 2007,
Australia
After attending this presentation, attendees will gain knowledge of the
capabilities of a novel technique (infrared chemical imaging) for imaging
latent fingermarks on difficult surfaces.
With technology continuously evolving, this presentation will impact
the forensic community and/or humanity by exploring new developments
that may prove to be superior to techniques currently in use in forensic
laboratories. Infrared Chemical Imaging has been demonstrated to be
effective for detecting fingermarks on difficult substrates.
This poster will present the results of a study that began in 2003 and
continues to date. During this study the use of a new technique, Fourier
transform infrared (FTIR) chemical imaging, has been demonstrated for the
enhancement of latent fingermarks on a number of surfaces.
All fingerprint detection techniques aim to create contrast between the
ridge details of a latent fingermark and the background on which it is
located. The majority of current methods rely on this contrast to be in the
visible part of the electromagnetic spectrum, and thus encounter problems
when background interferences such as printed images or patterns are
present. Some of these problems may be overcome using traditional visible
or fluorescence imaging techniques (e.g., alternate forensic light sources
with appropriate barrier filters) or visible and fluorescence chemical
(hyperspectral) imaging techniques. However, due to the very broad, overlapping bands that make up all visible absorbance and fluorescence spectra,
it is not always possible to obtain acceptable fingerprint images even using
chemical imaging techniques in this region of the electromagnetic
spectrum.
The vibrational spectra (infrared or Raman) of most carbon compounds consist of large numbers (often more than ten) narrow, wellresolved bands that represent vibrational modes of discrete functional
groups in these molecules. As a means of identifying and discriminating
between different molecules, vibrational spectra are thus far more powerful
than UV-visible methods, which consist of very broad, overlapping bands.
To date, this inherent feature of infrared (and Raman) spectra has not been
utilized in the forensic visualization of fingermarks. This is because that,
45
until recently, infrared and Raman techniques provided no spatial information on a sample. Spatially resolved chemical information, however, is
now accessible with the development of infrared chemical imaging.
FTIR chemical imaging employs a focal plane array (FPA) detector
that can be thought of as a large number (thousands) of discrete detectors
(or pixels) laid out in a grid pattern (Digilab, Nicolet, Bruker instruments).
The instrument collects images that may consist of thousands of pixels,
with a spectrum at each pixel. In this way thousands of mid-infrared spectra
are simultaneously collected from a sample while maintaining spatial information.
By far the most common type of FPA detector used for mid-infrared
chemical imaging is a 64 × 64 pixel mercury cadmium telluride (MCT)
focal-plane array detector. The detector used in this study was a Digilab
Lancer 64 x 64 MCT detector. This detector collects 4096 infrared spectra
simultaneously into a file that can be thought of as a datacube. This three
dimensional datacube (x x y x wavenumber) can be visualized as a
collection of images of the sample, with one image for each wavenumber
resolution unit.
This poster describes the application of infrared chemical imaging to
the visualization of fingermarks, with and without cyanoacrylate fuming,
and explores the future possibilities of this technique. Images of untreated
fingermarks on glass substrates with excellent ridge detail were acquired
using infrared chemical imaging. High quality fingermarks on glass
substrates were also developed using ethyl cyanoacrylate (super glue)
fuming and subsequent infrared chemical imaging. This new method
allows the collection of images from backgrounds that traditionally pose
problems for current fingerprint detection methods. The background may,
for example, be highly colored, have a complex pattern, or possess other
pattern or image characteristics that make it difficult to separate fingerprint
ridges using traditional optical or luminescent visualization. One background that has proven to be a challenging surface for the development of
latent fingermarks is the Australian polymer banknote. To demonstrate the
power and applicability of infrared chemical imaging, latent fingermarks
fumed with ethyl cyanoacrylate were successfully imaged from Australian
polymer banknotes.
This imaging technique has shown enormous potential for the
detection and enhancement of latent fingermarks on a range of surfaces.
This work is currently being extended so that the true capabilities of
infrared chemical imaging may be realized. It is important to stress that this
new method does not aim to replace any of the currently used fingerprint
enhancement techniques, but rather aims to provide the forensic scientist
with a tool that may prove useful on surfaces where conventional techniques fall short.
Infrared Chemical Imaging, Latent Fingermarks, Hyperspectral
Imaging
B30
Development of a Rubber Stamp
for Fingerprint Research
Christie Wallace-Kunkel, BSc, and Claude Roux, PhD, University of
Technology, Sydney, Centre for Forensic Science, PO Box 123, Broadway,
NSW 2007, Australia; Chris Lennard, PhD*, and Milutin Stoilovic, MSc,
Australian Federal Police, Forensic Services, GPO Box 401, Canberra,
ACT 2601, Australia; and Philip Doble, PhD, University of Technology,
Australia
humanity by demonstrating the use of the rubber stamp for fingerprint
detection research will allow fingerprint reagents to be directly and
accurately compared not only within one fingerprint research project but
across different research projects. Significant applications for quality
assurance purposes are also envisaged.
Latent fingermarks produced for research purposes are generally
deposited by the same donor(s) at various times throughout the course of
the project. The problem with this approach is that each fingermark
deposited will differ in chemical composition and pressure applied due to
environmental and physiological factors. Thus the results cannot be compared directly, as the composition of each latent mark on the support surfaces will vary to some extent.
The purpose of this research was to develop a rubber stamping process
for the production of ‘standard’ latent fingermarks for the evaluation of fingerprint reagents, ensuring that the same quality print would be deposited
with each application, thus allowing direct comparison not only within one
research project but across various research projects.
The development of the rubber stamp involved three processes:
1) The development and manufacture of a rubber stamp. Inked
thumbprints were obtained, scanned onto a computer, and sent to
a rubber stamp making company. The stamps were ready within
48 hours.
2) The formulation of a ‘standard’ amino acid solution and the
determination of a method of application. The formulation of the
solution was determined by investigating the concentration of
amino acids in eccrine secretions (human sweat). Inkless stamp
pads were obtained to which the amino acid solution was added.
3) Method validation as well as transfer and persistence studies.
This involved an investigation of the variations in amino acid
concentration between stamp applications. A high performance
liquid chromatography (HPLC) method was developed and
validated for the detection of amino acids in a water-based
solution and in deposited marks.
Using high performance liquid chromatography, it was found that the
amino acids did not persist on the rubber stamp, nor did the concentration
of the amino acids vary over time to any significant extent. This means that
each impression laid by the stamp was qualitatively and quantitatively constant — this was the desired outcome for the use of the procedure as a comparative research tool.
The whole process enabled a rubber stamp to be developed and used
for the application of ‘standard’ latent fingerprint samples to be used for
research purposes. Through this process, fingerprint reagents can be
directly compared against a uniform ‘standard’. Application of this method
in the study of amino acid based fingerprint reagents removes a large
number of variables associated with the use of latent fingermarks deposited
by a range of randomly-selected donors. A similar strategy could also be
used for the development of proficiency tests and quality control checks for
the evaluation of latent fingermark detection protocols. To date, no such
tests are available.
The use of a rubber stamp and an amino acid solution of known concentration cannot replace natural fingermarks, but should be considered as
an option for the objective evaluation of an amino acid based fingerprint
detection technique. While this option may appear simplistic, it goes some
way towards reducing the variables that typically impact on fingerprint
detection studies.
Latent Fingermarks, Rubber Stamp, Quality Control
After attending this presentation, attendees should consider the use of
a rubber stamp and an amino acid solution as a method for producing
standard latent fingermarks for the evaluation of amino acid specific fingerprint reagents.
46
* Presenting Author
B31
Chemical Processes Related to the
Development of Latent Blood Fingerprints
Melinda K. Lux, BS*, Marshall University Forensic Science Graduate
Program, Forensic Science Center, 1401 Forensic Science Drive,
Huntington, WV 25701; and Steven P. Kasper, Florida Department of
Law Enforcement, Fort Myers Regional Operations Center, 4700
Terminal Drive, Suite 1, Fort Myers, FL 33907
There are many different chemical methods of developing latent blood
fingerprints. The goal of this presentation is to address what is the best way
to develop these blood fingerprints, especially when those blood fingerprints are found on dark surfaces at a crime scene.
humanity by demonstrating how the use of Ninhydrin, Amido Black, and
Coomassie Blue are not feasible in these cases where blood is found on
dark surfaces because they stain the fingerprint ridges a purple or dark blue
color that is not visible on these dark surfaces. The solution may be a
different color stain or one that fluoresces the blood print long enough to
photograph it.
Latent blood fingerprints found on dark surfaces at a crime scene are
not useful when developed with Ninhydrin, Amido Black and Coomassie
Blue. These three examples are common techniques used on blood prints
that stain the fingerprint ridges purple or dark blue which may not be visible
on many dark surfaces. The solution to visualize these prints may be a
different color stain or one that fluoresces a blood print long enough to
photograph it. The chemical processes used in this study are ABTS,
Merbromin, IND, Leucomalachite Green, Fluorescein, DFO, and
Leucocrystal Violet. The fluorescent nature of many of these processes
may assist in visualizing these latent blood fingerprints.
Latent, Blood, Fingerprint
B32
Evaluation and Comparison of the
Electrostatic Detection Apparatus and
the Electrostatic Dust Print Lifter on
the Development of Footwear Impressions
on Paper
Christine L. Craig, MS*, Seminole County Sheriff’s Office, 100 Bush
Boulevard, Sanford, FL 32733; Breanne Hornsby, BS, 12124 Knights
Krossing Circle, #306, Orlando, FL 32817; and Matthew Riles, BS,
1823 Van Pelt Road, Sebring, FL 33870
After attending this presentation, attendees will learn that the
Electrostatic Detection Apparatus (ESDA) can be used to develop indented
footwear impressions on paper; the attendee will learn the ESDA can be
used in conjunction with the Electrostatic Dust Print lifter to obtain
footwear impressions from paper; the attendee will learn which technique
(the ESDA or the Electrostatic Dust Print Lifter) should be used to obtain
the highest quality footwear impression; the attendee will also learn that if
both techniques are used what order they should be used in to obtain the
best footwear impression; and the attendee will also learn the ESDA will
obtain footwear impressions on the top sheet of paper if a stack of papers
are stepped on and the Electrostatic Dust Print Lifter lifts higher quality
impressions as the amount of dust residue transferred to the surface
decreases. This presentation will give athe attendees new ideas and uses for
the equipment they may have already or plan to purchase.
This presentation will impact the forensic science community and/or
humanity by allowing the forensic science community to understand what
equipment should be used to obtain the highest quality footwear impressions from paper evidence. Crime Scene and forensic laboratory personnel
are always trying to obtain the best evidence possible. This presentation
* Presenting Author
will give the forensic science community new ideas for developing
footwear impressions on paper evidence and will give them a reference on
which technique should be used. It will also show that if both techniques
are used, what order they should be used in to obtain the best evidence.
Therefore, this presentation will help the forensic community decide what
techniques to use in order to obtain the highest quality footwear impression.
The Electrostatic Dust Print Lifter is commonly used to lift footwear
impressions from paper. The Electrostatic Detection Apparatus (ESDA),
traditionally used to enhance indented writing, can also be used to develop
footwear impressions on paper. This research compared the two methods
for developing footwear impressions on paper in order to determine if both
processes could be used to develop footwear impressions of the same or
similar quality and in what order they should be used to develop the highest
quality footwear impression. The sensitivity of each technique was also
evaluated. The quality of the footwear impressions developed was determined by comparing twenty-five individual characteristics present on the
known shoe to the footwear impressions developed using each technique.
These footwear impressions were made by stepping on paper placed over
several different surfaces. These surfaces included: linoleum, industrial
Berber carpet, nylon carpet placed over a 3/8-inch pad, ceramic tile, cardboard, 1-inch foam, 4-inch foam, cement, asphalt, grass, and mulch. Each
of the papers placed on these surfaces were developed using the
Electrostatic Dust Print Lifter before the ESDA and using the ESDA before
the Electrostatic Dust Print Lifter. The sensitivity test for the ESDA was
conducted by placing ten sheets of paper (stacked) onto a carpeted hallway.
This stack of paper was then stepped on with the known shoe. Each piece
of paper in the stack, beginning with the top sheet, was processed with the
ESDA until no footwear impressions were developed. The sensitivity test
for the Electrostatic Dust Print Lifter was conducted by placing ten sheets
of paper along a carpeted hallway. Each sheet was stepped on with the
known shoe in succession beginning with the first sheet. Each of these
sheets was processed with the Electrostatic Dust Print Lifter and compared.
This study determined the footwear impressions developed using only the
Electrostatic Dust Print Lifter were of better comparative value than
impressions developed with only the ESDA. On average, 72.4% of the
individual characteristics from the known impression were identified on
images developed when only the Electrostatic Dust Print Lifter was used
compared to an average of 38.9% when only the ESDA was used.
Therefore, if only one technique is used, the Electrostatic Dust Print Lifter
should be chosen. This study also determined if both methods are used on
a piece of evidence, the ESDA should be used first and the Electrostatic
Dust Print Lifter should be used second. This order results in satisfactory
impressions with the ESDA and the Electrostatic Dust Print Lifter compared to using the Electrostatic Dust Print Lifter before the ESDA, which
results in very low quality images with the ESDA. On average, 45.5% of
the individual characteristics were identified using the ESDA first and the
Electrostatic Dust Print Lifter second compared to an average of 72.4%
using the Electrostatic Dust Print Lifter first and the ESDA second.
Therefore, if the choice is available, the Electrostatic Dust Print lifter
should be used instead of the ESDA. Unfortunately, if the Electrostatic
Dust Print lifter is used first and the ESDA second, the results obtained
using the ESDA will be of very low quality. The sensitivity test determined
the ESDA develops high quality footwear impressions only on the top sheet
of paper if the papers were stacked when the impression was placed on the
paper. No footwear impressions were developed on any sheets under the
top sheet of paper. The sensitivity test also determined the Electrostatic
Dust Print Lifter results increase in quality as the amount of dust residue
decreases on the surface. Therefore, crime scene technicians should be particularly interested in the top sheets of paper on a surface and footwear
impressions in trace amounts of dust residue. These types of footwear
impressions will most likely result in higher quality impressions that retain
the most individual characteristics.
Footwear Impression, Electrostatic Detection Apparatus,
Electrostatic Dust Print Lifter
47
B33
Seasonal Variation of Phosphatase and
Sulfatase Levels in Soil and Their Potential
Use in the Comparison of Evidentiary
Soil Samples
Lawrence A. Quarino, PhD, and Janine M. Perna, BS*, Cedar Crest
College, Forensic Science Program, 100 College Drive, Allentown,
PA 18104
possible utilization of enzyme activity in the comparison of soil samples.
humanity by helping with the development of a screening method for the
comparison of soil samples.
Enzyme activity in soil may vary according to geographical location
and may be useful as a comparative tool in forensic geology. The type of
location, weather conditions, and the season may influence the variability
of enzyme activity.
Thorton and McLaren (1) were the first to propose enzymatic characterization to differentiate soil. Their study, however, is somewhat limited
since seasonal variation was not accounted for. This study is designed to
examine the role of seasons and to better assess the use of enzymatic
analysis for comparative purposes in soil.
Soil samples were collected from four areas of differing topography
and geography and assayed spectrophotometrically for the presence of two
specific enzymes: phosphatase and sulfatase. Samples were taken from a
location near water, an open field, a wooded area, and a sample from a
hillside. Samples were collected during the spring, summer, fall, and
winter. During each collection, five samples were taken fifty feet from a
central point and mean values for enzyme activity determined.
Statistical analysis using one way-analysis of variance at 95% confidence was conducted to determine significant differences in enzyme concentration among the sites. Greater variation exists between collection sites
than within samples from the same site for each individual season. Results
indicate that variation in enzyme concentration does exist between sites but
the extent of the variation changes with season. Sample locations show
greater differences in the spring and summer than in the fall or winter.
The application of the method as a screening method used in conjunction with soil color comparison and particle size distribution will also
be discussed.
1. Thorton JI, McLaren AD. Enzymatic characterization of soil evidence.
J. of Forensic Sci. 1975; 20: 674-92.
Soil, Phosphatase, Sulfatase
B34
Detection and Identification of Personal
Care Products in Sexual Assault Cases
JoAnne Marzowski, PhD*, Washington State Patrol Crime Laboratory,
2203 Airport Way South, Suite 250, Seattle, WA 98134; Andrew W.
Getz, Eastern Washington University, Cheney, WA 99004; and Kathy M.
Geil, BS, MS, Washington State Patrol Crime Laboratory, 2203 Airport
Way South, Suite 250, Seattle, WA 98134
The goal of this presentation is to detect and identify key ingredients
of ointments, creams, lotions and personal lubricants on evidence
submitted in sexual assault cases where there is no DNA present.
humanity by allowing the forensic scientist to determine if a personal care
product was used in a sexual assault. This analysis may provide supportive
case evidence and corroborate victim/suspect statements
Personal care products such as ointments, creams, lotions, and
personal lubricants used by assailants in sexual assault cases may serve as
important evidence when there is no DNA present. Detection and
48
subsequent identification of key components of personal care products on
clothing and in sexual assault kits may also provide supportive case
evidence and corroborate victim/suspect statements.
A representative sample of eighteen personal care products, including
hydrophobic petrolatum based ointments, water based lotions, sunscreens,
face and hand creams, were examined in this study. These products were
smeared onto clothing and cotton swabs to simulate case evidence. A
flowchart used for the detection of smears and analysis of key components
of each type of personal product will be presented.
This study describes the detection of smears on clothing and cotton
swabs using a combination of visual observation, short and long wavelength ultraviolet light, the Forensic light source, and attenuated total
reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. In
addition, polarized light microscopy (PLM) is used to detect anisotropic
smear components.
This study also describes protocols for the extraction of smears from
the substrates and the identification of key components using various
analytical methods, including Fourier transform infrared spectroscopy
(FTIR), gas chromatography / mass spectroscopy (GC/MS), pyrolysis gas
chromatography / mass spectroscopy (pyrGC/MS), scanning electron
microscopy /electron dispersive x-ray spectrometry (SEM/EDX), capillary
electrophoresis, and/or high performance liquid chromatography (HPLC).
Ointments Creams Lotions, Sexual Assault, FTIR GC/MS CE
B35
Comparison of Pressurized Fluid Extraction
Methods of Adsorbents For Use In Human
Scent Evidence Collection
Paola A. Prada*, Florida International University, University Park,
CP345, Miami, FL 33199; and Alison M. Curran, BS, and Kenneth G.
Furton, PhD, International Forensic Research Institute, Florida
International University, University Park, Miami, FL 33199
After attending this presentation the attendee will learn the uses and
applications of pressurized fluid extraction methods and their implementation for the purpose of the removal of organic volatile compounds from
adsorbents used to collect human scent.
humanity by providing a better awareness for the selection of adsorbent
materials used in the collection of human scent. The removal of the organic
compounds present initially on collection materials will lead to a more
“chromatographically clean” medium from which to analyze human scent
for evidentiary purposes.
The use of human scent identification by canines has been featured
recently in a number of recent high profile court cases within the United
States. While accepted in several European countries, the strict requirements for scientific evidence admissibility in the United States, set forth by
the Frye and Daubert rulings have restricted the application of canine
human scent identifications within the U.S. This is due in part to a lack of
definitive studies demonstrating the reliability and validity of this approach,
which has led to successful legal challenges to the use of these biological
detectors in a court of law. As part of the scientific investigation into the
forensic validity of canine identification of human scent, the chemical composition of scent must be proven to be unique to an individual and the scent
profile must be proven to be stable over time. The instrumental determination of the organic compounds present in human odor plays an important
role in determining the uniqueness of human scent, and thus the
optimization of mediums for the collection of human odor is also of great
interest.
Presently, there are two main methods for the collection of human
scent for the purpose of both instrumental and canine scent identification.
The direct method is collecting the actual object, and the indirect method is
collecting the odor on an absorber such as sterile gauze. Sterile gauze can
be placed either in direct contact or placed close to the person or object of
* Presenting Author
interest. Air is also commonly drawn through the gauze pad in an attempt
to increase the collection of odor. Canines have shown the natural ability
to discriminate between odors in the presence of a high background,
whereas instrumental analysis requires a significantly lower background.
Despite sterilization through autoclave cleaning, the headspace analysis of
sterile gauze pads using Solid Phase Microextraction with Gas
Chromatography - Mass Spectrometry (SPME-GC-MS) has highlighted
the presence of several organic compounds present within the sterile gauze
prior to use. Thus sterile does not equate to chemically clean, and the
contamination of the gauze observed has proven to be a serious limitation
of the use of sterile gauze as an effective odor collection media for the
instrumental identification of the compounds present in an individual odor
profile.
This paper discusses the use of carbon dioxide Supercritical Fluid
Extraction (SFE) as a potential method of chemical cleaning of the gauze
pads. A parallel study of the effect of SFE and Subcritical Water Extraction
of absorbers will be presented. Optimization of the extraction parameters
evaluated includes temperature, pressure and extraction time, and the use of
chemical modifiers such as methanol and water will also be presented.
Soxhlet extraction of absorbers through the use of various solvents, such as
methylene chloride, methanol and chloroform, will also be presented.
The chemical odor of gauze pads from various manufacturers and the
absorbers currently used in European countries for the collection of scent
evidence will be presented before and after SFE cleaning. This study is
intended to demonstrate the importance of informed selection of gauze
pads with minimal background odor, and those which can be cleaned most
effectively to minimize any potential distracting odors from the gauze.
With the use of chemically clean odor absorbers it is proposed that a better
understanding of the composition of the chemical profile of human scent
may be obtained, in turn benefiting the scientific acceptance of human
scent identification by canine.
Human Scent, Supercritical Fluid Extraction, SPME-GC/MS
B36
Terminal and Secondary Effects
of Bullets Fired Through Automobile
Windshield Glass
Ginger E. Eastham, BS*, Marshall University Forensic Science Program,
1401 Forensic Science Drive, Huntington, WV 25701; and Rodger R.
Reed, BS, West Virginia State Police, 725 Jefferson Road, South
Charleston, WV 25309
After attending this presentation, attendees will learn about data
regarding trends in terminal ballistics and secondary effects of bullets fired
through automobile windshield glass. These trends include effects on the
glass, on witness panels, and in body armor vests that correlate to factors in
bullet type, velocity, and weight retention.
humanity by demonstrating to forensic professionals and laymen how fired
bullets react when passing through a glass obstruction, and the terminal
results of said projectiles on the target. Law enforcemnt personnel will
have a better understanding of ammunition characteristics in such a
situation, and thus, will be better informed regarding choice of ammuniton
to produce the effects desired by their agency.
While many studies have been conducted to explore terminal
ballistics, most have been in response to requests from military and law
enforcement agencies for data concerning penetration and wound patterns.
Additionally, several studies have been completed addressing the terminal
ballistics of bullets fired into body armor. However, very little literature
currently exists that seeks to observe effects of bullets fired through
obstructions.
In a laboratory environment, results obtained reflect ideal shots. In
reality, many situations encountered by law enforcement personnel are
much less than ideal. The high stress nature of such moments has a high
* Presenting Author
impact on officers and suspects alike, and can cause widely varying results
in reaction time and aim. The environs of the conflict further compound
altercations of this nature. In other words, most situations occur as parties
are firing at one another from behind some solid object or glass rather than
a one-on-one confrontation on open ground. Any obstacle in the bullet path
will change the effects of that bullet upon its final target, if it reaches the
target at all. A controlled environment is necessary to observe any
phenomena or trends of bullets fired through solid objects, but this will
necessarily reduce the random nature of the very act the experiment is
trying to replicate.
In particular, this experimentation was geared toward recording
effects produced by firing through a glass obstruction. Glass was deemed
a better material in which to visualize effects while keeping incidence of
low angle impact (ricochet) low. Such cases involving glass are often
experienced in shootouts as well as on the highway during driveby
shootings. One such scenario encountered by law enforcement personnel
occurs when they use their vehicles for cover from fire. With the support
of the West Virginia State Police and its Firearm/Tool Mark section
laboratory, this scenario was replicated for study. Shots were fired from
approximately six feet away through a windshield and into a stabilized
body armor vest. The setup was accomplished in part from the generous
donation of windshields from a local supplier.
This poster will display the examined effects of bullets fired through
an auto glass obstruction as well as the affect of velocity and weight
retention upon the observed results. Additional factors in ammunition
performance such as bullet type and manufacturing process are discussed.
Seventeen forty-caliber (.40) common-duty ammunitions currently in use
by law enforcement agencies were fired through glass windshields and
witness panels into body armor. Velocity and weight retention as well as
diameter of all bullet holes and other secondary effects were measured and
recorded. Control tests of body armor vests as well as bullet recovery tank
testing were also performed. Study of multiple test fires revealed general
trends in bullet interaction with the windshield glass, the witness panel, and
the body armor, respectively. Type of bullet played a significant role in the
presence or lack of fragmentation. Of all brands tested, Federal Cartridge
Co. Tactical law enforcement ammunition produced the highest area and
approximate volume of damage upon impact with target. However, the
philosophy of a particular agency or a particular situation in which shots are
fired may determine which ammunition should be used to obtain desired
result.
Terminal Ballistics, Firearms, Glass
B37
LA ICPMS and IRMS Isotopic
and Other Investigations in
Relation to a Safe Burglary
Gerard J.Q. van der Peijl, PhD*, Netherlands Forensic Institute of the
Netherlands, Ministry of Justice, PO Box 24044, The Hague, 2490 AA,
Netherlands; and Shirly Montero, PhD, Wim Wiarda, Ing, and Peter de
Joode, Ing, Netherlands Forensic Institute, PO Box 3110, Rijswijk, 2280
GC, Netherlands
After attending this presentation, attendees will appreciate the strong
discriminating power of isotopic technique such as (LA) ICPMS and
IRMS, not only for these specific safe burglary investigations but for a wide
spectrum of other forensic investigations.
humanity by making forensic community further aware of the strong power
of LA ICPMS and IRMS isotopic techniques.
Safe wall filling material was released when an old safe was
burglarized. During a search at the suspect’s residence, visually similar
material (mixture of glass like particles and sawdust) was retrieved from a
plastic bag containing money. Small iron-containing particles were also
retrieved from both samples. The safe wall filling material was found to
49
consist of a mixture of alum or potassium alum (KAl(SO4)2.12H2O)
crystals (XRF/XRD) and sawdust (vis, FT-IR). All three material fractions
(alum, sawdust, metal particles) were intercompared for the two samples.
The material combination of alum and sawdust appears very rare.
Information was collected on the history of its use as safe wall filling,
alternative applications of this material combination and how often Dutch
police organisations encountered this material in the last two years. It was
concluded that this material combination was only used for safe wall filling
in the period before the 2nd World War, that no alternative applications
were found and that no police organisation reported encountering this
material combination.
Alum investigations: The glass like particles in both material
samples were classified as alum. ICP AES results were obtained using a PE
OPTIMA 3000 instrument. Apart from the major elements Al and K (S was
not measured) Cr and Tl were observed at similar levels in both samples.
Other elements observed (Fe, Sr,..) were present at much higher concentrations in the red-brown powder so that these are not confidently attributed to
the alum samples.
LA ICPMS results using a PE ELAN 6100 DRC PLUS instrument
were obtained on freshly cleaved inner alum crystal surfaces. Elements
observed in both samples are Mg, Si, P, Ti, Cr, Cu, Zn, Ga, Rb, Sr, Sn, Ba,
Tl and Pb.
IRMS services were provided by Iso-Analytical Ltd (Sandbach, UK)
using standard methods on a Europa Scientific Geo 20-20 instrument with
an EA-IRMS interface. Different isotope ratios were measured in separate
experiments using different experimental configurations of the instrumentation. The mean δ34S values for the suspect and crime scene alums (both
2.2 ± 0.1 ‰, n = 6) were undistinguishable using an experimental uncertainty of 0.24 ‰ (2s). This is compared to a variation range of -3.9 to +30.6
‰ as reported [1] for δ34S values obtained for a large number of alum minerals from various locations throughout the world and a variation range of
1.7 to 9.8 ‰ for a small test set of four different alum samples as obtained
from alum suppliers in the Netherlands.
Sawdust investigations: The suspect and crime scene sawdust
samples are visually similar and exhibit the same red brown color. A
mixture of wood species, both soft and hard woods, was observed in both
samples during botanical species investigations at the National Herbarium
of the Netherlands. Over five species were identified in the suspect sample.
IRMS isotope ratios δ2H, δ13C en δ18O for both the suspect and the
crime scene sawdust fractions agree within the experimental uncertainty
(2s, n=6). δ13C=-25,71+ 0,15 is e.g. compared to a variation range of -32
to -22 ‰ as reported for the δ13C values of C3 plants [2]. Applicability of
this information for the local situation is tested by collecting a limited set
of sawdust samples in the Netherlands market and analysing these by
IRMS. For δ13C e.g. a variation range of -23 to -28 ‰ is measured.
Metal particles investigations: In both samples many minute metal
particles were observed that were magnetically separated from the sample
matrix. Corresponding variations in morphology of the particles (round
balls of various sizes and curved lint like particles) indicate that metal particles in the two samples were formed through a similar process consistent
with abrasive cutting of a safe [3]. µ-XRF (EAGLE) results for the round
balls and lint particles show a high abundance of Fe as well as the presence
of other elements such as Al, Si, P, S, Mn and Cu. Similar results were
obtained for the fine metal particle fractions in both samples.
Conclusions: Combining the information from the various sources
and the analytical results for the various material fractions (sawdust, alum,
metal particles) provides a strongly discriminating method to compare the
(combination of) material fractions as found in the two samples at the
suspect’s residence and at the scene of crime.
References
1. Rye, R.O., P.M. Bethke and M.D. Wasserman, The Stable Isotope
Geochemistry of Acid Sulphate Alteration, Economic Geology 87 (1992)
225-262
2. Cerling, T. E., J. M. Harris, B. J. MacFadden, M. G. Leakey, J. Quade, V.
Eisenmann and J. R. Ehleringer, Global change through the
Miocene/Pliocene boundary. Nature 389 (1997) 153-158.
50
3. Zeichner A., G. Feingold and E. Landau, “Abrasive cutting of a safe: a
case study”, Journal of Forensic Science 38 (1993) 1516-1522
ICPMS, IRMS, Safe
B38
An Analytical Approach to Comparative
Bullet Lead Analysis: Physical and
Chemical Aspects of Discrimination
Diana M. Wright, PhD*, Charles A. Peters, BS, and Marc A. LeBeau,
MS, FBI Laboratory, Chemistry Unit, Room 4220, 2501 Investigation
Parkway, Quantico, VA 22135
After attending this presentation, attendees will understant the
methodology used for the physical and chemical analysis of bullet lead
specimens. The protocol, method validation, report terminology, and
significance assessments generally conveyed in testimony regarding positive associations of comparative bullet lead evidence will be presented.
humanity by educating the forensic community to the steps taken to
validate a protocol for quantitative analysis of a manufactured product. It
will describe how the protocol was validated and provide the community
with examples of the language used in reports and during testimony to
convey the conclusions drawn from the analysis.
Comparative bullet lead analysis is the physical and chemical examination of lead bullets, fragments, or shot pellets. It is performed when a
firearm is not recovered or if a bullet or lead fragment lacks sufficient
marks of value for a firearms examiner to determine conclusively that the
specimen can be associated with a specific firearm. This examination is not
as probative as a positive association between a firearm and the ammunition it discharged. However, comparison of recovered cartridges to the
bullets or fragments from the victim or scene can provide a circumstantial
link based on the ammunition used in the commission of a crime.
This poster will describe the most current protocol used by the FBI
Laboratory to perform this examination, which has been used in support of
local and federal law enforcement investigations for over 35 years. While
the sample described in this work requires certain parameters, the methodology can be easily adapted to analysis of any of the wide range of specimens increasingly encountered in modern forensic laboratories in the 21st
century. For example, small modifications would allow the digestion procedure to be readily adapted to the analysis of glass or steel specimens.
The protocol begins with a physical comparison of the items
submitted. Many discriminating features are commonly found on ammunition that can be used to disassociate items quickly and conclusively.
These differences and the documentation necessary to describe them will
be discussed.
In the absence of physical discriminators, a chemical analysis of the
submitted lead specimens is required. The procedure will be described in
detail to include: documentation of the physical alterations necessary to
sample the evidence; the chemical digestion process; quality assurance and
controls; and instrumentation used. Validation data for the chemical
analysis of bullet lead specimens will be offered for consideration. The
parameters that were measured in validating this method include: limits of
detection and quantitation, accuracy, within-run precision, between-run
precision, precision using separate analysts for data collection, linear range,
sensitivity, and analyte recovery.
Results will be offered for a sample case in which the physical and
chemical examinations could not differentiate between two or more specimens. The language used to report these findings will be provided. Lastly,
the conclusions or interpretation that a qualified examiner would place on
these findings will be described as a guideline for the strength and limitations of quantitative analysis applications to commercially - available manufactured products.
Bullet Lead Analysis, Compositional Analysis, Comparative
Examinations
* Presenting Author
B39
Forensic Elemental Analysis of Glass by
Laser Induced Breakdown Spectroscopy
(LIBS), Laser Ablation ICPMS, and
X-Ray Fluorescence
Sayuri Umpierrez, BS*, Waleska Castro, MS, and Marilyn Prieto, BA,
Florida International University, Department of Chemistry and
Biochemistry and International Forensic Research Institute, 11200
Southwest 8th Street CP 194, Miami, FL 33199; Scott Ryland, BS,
Florida Department of Law Enforcement, 500 West Robinson Street,
Orlando, FL 32801; and José R. Almirall, PhD, Florida International
University, International Forensic Research Institute, Department of
Chemistry and Biochemistry, 11200 Southwest 8th Street, CP 316,
Miami, FL 33199
After attending this presentation, attendees will learn about different
solid sampling techniques for elemental analysis: laser induced breakdown
spectroscopy (LIBS), laser ablation inductively coupled plasma mass
spectrometry (LA-ICP-MS), scanning electron microscopy with an energy
dispersive spectrometer (SEM EDX) and x-ray fluorescence (XRF). The
advantages, disadvantages, and application of these techniques to forensic
casework will be discussed.
humanity by demonstrating the different solid sampling techniques for
elemental analysis: laser induced breakdown spectroscopy (LIBS), laser
ablation inductively coupled plasma mass spectrometry (LA-ICP-MS),
scanning electron microscopy with an energy dispersive spectrometer
(SEM EDX) and x-ray fluorescence (XRF).
Materials analysis and characterization can provide important information as evidence in legal proceedings. Although the utility of trace elemental analyses for comparisons of glass, paint fragments, bullet lead and
metal fragments has been shown to offer a high degree of discrimination
between different sources of these materials, the instrumentation required
for the generation of good analytical data in forensic comparisons can be
costly and require a high degree of analytical sophistication. Refractive
Index (RI) has been used for glass comparisons in combination with
elemental analysis using a variety of methods of solid sampling, including;
Scanning Electron Microscopy with an Energy Dispersive Spectrometer
(SEM-EDX), x-Ray Fluorescence (XRF), Laser Ablation Inductively
Coupled Plasma Atomic Emission Spectroscopy (LA-ICP-AES) and, more
recently, LA-Inductively Coupled Plasma Mass Spectrometry (LA-ICPMS). A newly developed Laser Induced Breakdown Spectroscopy (LIBS)
instrument (Foster and Freeman Ltd., Evesham, U.K.) has been evaluated
as a tool for the forensic elemental analysis of glass and compared in performance to other elemental methods in order to determine the utility of
comparing casework sized glass samples. Developments in instrumental
design of the LIBS system are presented. The discrimination power
afforded by the elemental analysis of a sample set having similar refractive
indices measured by the LIBS system is reported in contrast to that
provided by micro-XRF and LA-ICPMS. The advantages and disadvantages of using these solid sampling elemental analysis techniques will also
be presented.
Solid Sampling Elemental Analysis, Glass, LIBS
B40
Choosing a Statistical Method for the
Data Assessment of the Compositional
Analysis of Bullet Lead
Diana M. Wright, PhD*, FBI Laboratory, Chemistry Unit, Room 4220,
2501 Investigation Parkway, Quantico, VA 22135; Robert D. Koons,
PhD, JoAnn Buscaglia, PhD, and Heather L. Peters, PhD, FBI
Laboratory, Counterterrorism and Forensic Science Research Unit, FBI
Academy Complex, Quantico, VA 22135; and Marc A. LeBeau, MS, FBI
Laboratory, Chemistry Unit, Room 4220, 2501 Investigation Parkway,
Quantico, VA 22135
The goal of this presentation is to provide a description of five statistical approaches to trace element concentration data is provided. These
methods were compared for 93 randomly selected cases. Results will
describe how each approach grouped the case data and explain which
approach was ultimately selected for use in current casework.
humanity by serving the forensic community through the discussion of
several statisitical approaches that one may utilize in determining
acceptable match criteria for quantitative analysis of man-made products.
The FBI Laboratory is one of the few forensic laboratories that
perform quantitative trace element analyses on a routine basis for a wide
variety of specimens, including glass, steel, and bullet lead evidence. The
bullet lead protocol was specifically developed by the FBI Laboratory over
35 years ago to assist local and federal law enforcement agencies with
shooting investigations where a firearm is not recovered or the fired bullets
are badly damaged. The protocol, including the association criteria used to
determine if two or more specimens are analytically indistinguishable, has
evolved over the course of this examination’s history. As the 21st century
progresses, the FBI Laboratory has revised its analytical protocol for
comparative bullet lead analysis. Part of this revision involved a review of
the statistical approach used to determine associations.
To that end, this poster will present work that has recently been
completed through the collaborative efforts of the FBI Laboratory
Division’s Chemistry Unit and the analytical research group of the
Counterterrorism and Forensic Science Research Unit. Five statistical
approaches were applied to the quantitative results collected for 93
randomly selected comparative bullet lead cases that have been submitted
to the FBI Laboratory over the last decade. The purpose of this study was
to determine if any of the results reported out to contributors using the
established criterion would have been affected if a different statistical
approach had been used.
The bullet lead protocol for the past decade has employed an association criterion that requires the measured precision of the specimens being
compared to overlap within the range of 2. Therefore, in order for two
specimens to be considered analytically indistinguishable, an overall range
of 4 was applied to the concentration results. The five methods compared
in this study were: range overlap, 2, the student t test, the successive t test,
and Hotelling’s T2 test. The first three methods utilized measured
precisions associated with the specific case results as a basis for establishing match criteria. The latter two statistical assessments required the use
of pooled historical data in order to calculate precision measurements for
the necessary equations. Any assumptions that were made in order to
perform the testing on the pooled results will be described.
Results will be presented for the five tested analytical approaches as
well as the conclusions issued in the corresponding reports. Ultimately,
there were no cases in which a Q/K association was reported in the absence
of corroborating associations from at least one of the tested methods. The
method chosen for the revised protocol will be described and the rationale
for its use will be addressed.
Statistical Analysis, Bullet Lead Analysis, Comparative Examinations
* Presenting Author
51
B41
Evaluation of Solvent Systems and Mobile
Phases for the Extraction and Identification
of Fiber Dyes by Liquid Chromatography
Mass Spectrometry (LC-MS)
Michael E. Sigman, PhD*, Min Huang, PhD, and Breanne Hornsby,
National Center for Forensic Science, University of Central Florida,
PO Box 162367, Orlando, FL 32816
The objective of this presentation is to demonstrate the advantages of
liquid chromatography – mass spectrometry (LC-MS) in the comparison of
questioned and known fibers. The compatibility of LC-MS methods with
existing dye extraction protocols will be emphasized.
humanity by emphasizing the need for enhanced methods for the analysis
of fiber evidence and demonstrating the compatibility of LC-MS methods
with existing FBI SWGMAT dye extraction protocols.
Previous research has shown that cotton fibers that are indistinguishable by means of microspectrophotometry, HPLC analysis and FBI
SWGMAT dye extraction protocols, may be discriminated by LC-MS
analysis of the extracted dyes. Mass spectrometry provides a molecularlevel interrogation of the dye structure and, as a result, allows the
differentiation of dyes having differing molecular structures. The same
level of discrimination is not possible based only on UV-visible absorption
profile, chromatographic behavior or extraction characteristics. The
previously reported LC-MS analysis methods have been extended by evaluating their compatability with the solvent systems recommended by FBI
SWGMAT protocols for fiber dye extraction. Solvent systemts that were
evaluated for LC-MS analysis included pyridine/water, formic acid/water,
acetic acid, chlorobenzene, chloroform, and dimethylformamide
(DMF)/formic acid (1:1). The dyes that were extracted in each solvent
system were readily chromatographed in a methanol/water gradient with
the extraction solvent exerting no significant influence on the chromatographic behavior of the dyes. The chromatographic behavior of the dyes
was found to be significantly influenced by the addition of 0.1% acetic acid
or trifluoroacetic acid to the mobile phase for the analysis of basic dyes in
positive ion mode. Similar enhancements were obtained by the addition of
TEA (triethylamine) to the mobile phase for the analysis of acidic dyes in
the negative ion mode. In both cases the additive enhanced sensitivity and
separation efficiency of the dye by ESI-MS analysis and reversed phase
chromatographic separation. The analyses were conducted on standards
comprised of dyes of known structure that had been commercially applied
to fibers of known composition.
This presentation will emphasize the need for enhanced methods for
the analysis of fiber evidence and demonstrate the compatibility of LC-MS
methods with existing FBI SWGMAT dye extraction protocols.
Fiber Analysis, Trace Evidence, Mass Spectrometry
B42
The Effects of Environmental and
Atmospheric Conditions on the
Longevity of Latent Prints
Michele Eichenmiller, BA*, Marshall University-Forensic Science Center,
1401 Forensic Science Drive, Huntington, WV 25701; Steven King, BA,
West Virginia State Police-Latent Print Section, 725 Jefferson Road,
South Charleston, WV 25309; and Pamela Staton, PhD, Marshall
University-Forensic Science Center, 1401 Forensic Science Drive,
Huntington, WV 25701
After attending this presentation, attendees will learn about the effects
of weather and humidity on the permanence of latent prints.
52
humanity by providing insight into the effects of different atmospheric and
environmental conditions on latent prints as they are exposed to varying
environments over a specified time. This scientifically gained information
can then be referenced in court proceedings when latent print examiners are
called to testify about the longevity of latent prints.
As latent fingerprints are deposited on a surface, several factors may
affect their recovery particularly as they age. Such factors include subject,
substrate and matrix, and environmental factors. “Subject” factors include
age, sex, stimuli, occupation, and medical conditions. For example, a car
mechanic with motor grease on his hands would leave a greasy latent print
that would resist degradation better than a print made up of mostly sweat,
as left by a person who has been exercising. In general, latent prints are
composed of 99% water and 1% oil secretions.
Some factors can be accounted for by the latent print examiner but
other influences affecting the deposited print are unknown. The examiner
does not generally know subject factors, such as age and medical conditions, which may influence the hardiness of the deposited print.
“Substrate” factors are associated with the distortion or interference created
by the surface on which a print is deposited. This is demonstrated by textured surfaces’ inability to retain a good impression as opposed to a smooth
surface, which would retain a good latent print. Matrix factors are those
involving the material making up the friction ridge skin impression and can
be deduced and assessed to some point from the submitted evidence. An
example of a matrix is the motor grease in the previous example.
While potentially important, examiners rarely receive information
associated with atmospheric and environmental factors that may impact the
latent print at the crime scene or on the evidence as it ages. These variables
include temperature extremes, humidity, and significant weather events
such as rain that may have influenced the permanence of the latent print.
All of these variables can interact with the water and oil content of the
latent print. This interaction will thereby affect how well the print is
preserved and how quickly it will degrade before it is rendered completely
useless for comparison purposes.
The effect of atmospheric and environmental factors on the
permanence of latent fingerprints is an often-raised question that latent
print examiners must face as they testify in court proceedings. Up to this
point, examiners have relied on personal knowledge to convey to the court
their opinion with respect to the longevity of fingerprints. This experience
is not based on peer-reviewed scientific research but rather on the experience of the examiner. In fact, when a literature search is conducted of
current journal articles, few studies are identified which document the
effects of different environmental and atmospheric factors on a variety of
substrates and matrices or on the life of a latent print left on such surfaces.
This study shows the effects of an indoor versus outdoor environment
on latent prints over the course of four weeks. Latent prints were deposited
on a variety of porous and nonporous surfaces and then placed either inside
the building or outside, in a sheltered location. Four types of prints were
left on each surface and then collected once a week for four weeks. The
four types of prints were clean, natural oils, artificial oils, and dirty prints.
The results of this experiment show a pattern of marginal latent print
longevity on porous surfaces exposed to summer heat and humidity. Prints
on nonporous surfaces also exhibited decreased longevity when exposed to
outdoor conditions. The permanence of latent prints decreases as a result
of the time spent outdoors. This is in opposition to the same surfaces kept
in an indoor environment at a constant temperature and humidity, which
exhibit greater permanence in regard to the latent prints, regardless of time
spent indoors.
This poster will present the work conducted at the West Virginia State
Police Forensic Laboratory-Latent Print section during a summer
internship. This internship is to fulfill the requirements of the Marshall
University Forensic Science Program Summer Internship.
Latent Prints, Longevity, Environmental Conditions
* Presenting Author
B43
Volatile Compounds Produced by
Decomposing Human Blood and
Those Detected by Cadaver Dogs
This study proposes that the volatile chemicals detected during the
decomposition of human remains must also be present during the decomposition of human blood. The use of fresh blood that is permitted to
decompose naturally, versus expired blood or plasma from a blood bank,
has the potential to affect the decomposition odor observed.
Wilma Jeffris, BA*, Samantha Tolliver, BS, and Kenneth G. Furton, PhD,
Florida International University, University Park Campus, CP 345,
Miami, FL 33199
SPME-GC-MS, Blood Decomposition, Cadaver Dogs
After attending this presentation, attendees will earn about the volatile
organic compounds that are produced as human blood decomposes and the
odor signature compounds cadaver dogs alert to.
By determining the odor signature compounds produced in aging
blood, better and less hazardous training tools can be developed. Better
training will lead to more reliable detection of human remains and trace
blood spatters not readily visible and identification of crime scenes where
bodies are not present. This presentation will impact the forensic
community and/or humanity by assisting in the identification of the odor
signature compounds which will lead to better trained cadaver dogs, more
reliable evidence gathered, better results in finding bodies, and future
development of instrumental methods with equal or better detection than
detector dog teams.
Cadaver detection canines are dogs trained specifically to locate
human remains. Although the use of canines as detection methods for
items of forensic interest has been accepted historically for many years, the
Frye and Daubert rulings of forensic evidence admissibility require
validation of scientific processes. Accordingly, the canines must be capable
of locating these remains in many environments, but must not be confused
by the decomposition of other animal species. Therefore, the training
protocols of most law enforcement agencies stipulate the use of human
remains and human blood, both in various degrees of decomposition.
Although these training practices are generally accepted within the canine
handling community, the safety concerns regarding the biohazards of
human tissue, and the possibility of infection of blood-borne disease such
as HIV/AIDS, and hepatitis B/C confirms that the training aids used by
handlers do pose a significant health risk. Currently available pseudoodors, those that mimic human decomposition, have been shown to be of
limited application to canine training. Training aids that effectively
reproduce the odor of decomposition without the associated risk of blood
handling have the potential to replace real tissue aids in most circumstances, while maintaining the high standard of odor discrimination.
The process of blood decomposition involves coagulation of the
blood, and thus may be limited or modified by the addition of anticoagulants such as EDTA and CPDA1 to the blood samples to extend shelf life
or prevent decomposition during storage. To date, the role that each
component of blood plays in the decomposition process has not been determined, nor have the compounds formed been identified. However with
coagulation playing an important role in the overall process, it is proposed
that the plasma component of blood is heavily involved.
Samples of blood and blood components, both with and without
anticoagulants, have been allowed to decompose over time. The headspace
of these samples has been collected and analyzed using Solid Phase
Microextraction (SPME) with Gas Chromatography - Mass Spectrometry
(GC-MS). Blood itself is a complex mixture of plasma and cells, hence
given the complexity of the blood sample, and the diverse nature of the
compounds present, polydimethylsiloxane (PDMS) and polydimethylsiloxane/divinylbenzene (PDMS/DVB) SPME fiber chemistries are
combined in complementary analysis.
Several variables were considered during the development of a
technique that will provide an efficient means of identifying the volatile
compounds. Blood and blood component samples were kept in various
temperatures including room temperature, 37 degree Celsius, and under
excessive heat. Seven-year-old, one-year-old, three-month-old, and fresh
blood samples were analyzed to determine the development and disappearance of the desired volatile compounds in the presence and in the
absence of anticoagulant.
B44
* Presenting Author
Examination of Counterfeit
Hong Kong $10 Bimetallic Coins
Nai-Chiu Kwok, BSc, MPhil*, Fu-Chiu Kwok, PhD, and Koon-Hung
Wong, PhD, Goverment Laboratory, 8/F, 88 Chung Hau Street, Homantin
Government Offices, Hong Kong, Nil Nil, China
After attending this presentation, attendees will learn a general
guideline of examination involving the physical parameters and surface
features in examination of bimetallic coins.
humanity by providing an examination guide on bimetallic coins including
the core-extrusion method which is an effective and reliable supplementary
method of examination. Moreover, the core-extrusion method may also be
applied to coins with similar construction.
This poster presents a number of important physical parameters, such
as surface features of the genuine bimetallic HK$10 coins which can be
utilized for the examination of counterfeit coins.
The Hong Kong ten-dollar coin was introduced into common circulation by the Hong Kong Monetary Authority towards the end of 1994.
However, just within six month after launching, counterfeit HK$10 coins
started to be found in the region. The first case of counterfeit HK$10 coins
was delivered to the Hong Kong Government Laboratory in the summer of
1995. Since then, there were significant increases in the number of cases
and the actual number of coins submitted for examination. The quality of
counterfeit ten-dollar coins which were first found was crude. They displayed significant difference, both in physical dimension and/or surface
features, to the control specimen. However, as time progressed, forgery
techniques appeared to have improved to such an extent that counterfeit
HK$10 coins were almost indistinguishable to the untrained eye from the
corresponding control coins.
General guidelines for the examination of HK$10 coins are as
follows:
1) The physical parameters of the coin, such as weight and
dimensions (thickness and/or overall diameter) are measured,
but as the physical parameters of counterfeit coins can most
easily be reproduced within a reasonable level of accuracy, thus
they would not provide a sound indication of authenticity.
2) The surface and edge characteristics of the counterfeit coin are
scrutinized and compared with genuine coins. For example, the
color of the bimetallic part is distinctly different from the control
specimen, the bonding between the core and the annulus is rough
usually; the inscribed words are of different fonts; the milling is
poor; the Bauhinia logo lacks clarity and details. In most of the
cases, visual examination would normally be sufficient to
distinguish a counterfeit coin from a genuine control.
3) Determination of the metal composition of the coins can also be
used. Accurate results can be obtained using such techniques as
Atomic Absorption Spectroscopy (AAS) or Inductively-coupled
Plasma-Atomic Emission Spectrometry (ICP-AES). However,
these techniques are destructive, labour-intensive and timeconsuming as they involve pre-treatment of sample. An
alternative method being used is the Scanning Electron
Microscope (SEM) – a non-destructive, reasonably accurate
technique that requires minimal sample treatment.
Recently, an effective physical method (core-extrusion method) has
been developed in the authors’ Laboratory. It makes use of the construction
53
of the coins itself. The HK$10 coin is bi-metallic consisting of a core made
of nickel-brass with a cupro-nickel annulus. The two metallic parts are held
together by a physical construction consisting of a groove at the outerperimeter of the core and a rim at the inner perimeter of the annulus.
Therefore, for the genuine coin, a greater force exerted by way of a
hydraulic press on the core will be required to separate it from the annulus
rim. By comparison that required for separating the core and the rim of a
counterfeit coin is only 20% of that for the genuine counterpart.
By far the most time-consuming step in the analysis of HK$10 coins
is the metal-composition determination. Whereas the most effective way to
distinguish a counterfeit HK$10 coin would be visual examination of the
surface features, such as the Bauhinia and the word fonts. Moreover, the
core-extrusion method also serves as an effective and reliable supplementary method of examination. The latter method may also be applied to
coins with similar construction.
Counterfeit, Bimetallic, Coins
B45
An Evaluation of the Trigonometric
Model for Point of Origin Prediction
in Bloodspatter Pattern Analysis
Anna S. Duggar, MS*, and Rose R. Duryea, MA, New Orleans Police
Department Crime Laboratory, 2932 Tulane Avenue, New Orleans,
LA 70005
After attending this presentation, attendees will learn the responsible
use of the trigonometric model in applied fieldwork and the value of
training by a qualified expert.
The discipline of bloodspatter pattern analysis continues to need peerreviewed scientific and statistical studies, particularly on essential methods.
meeting that need and providing quantitative arguments for training and
responsible method implementation.
The discipline of bloodspatter pattern analysis continues to need peerreviewed scientific and statistical studies, even on premises as essential as
the trigonometric formula historically used in the back-calculation of a
point of origin from individual droplet stains in an impact pattern.
Structured, objective scientific research in this field in the last two decades
has shown that even the most basic assumptions are subject to change as
understanding of the science is explored. In addition, recent judicial challenges to the testimony of the bloodspatter analysis expert as neither scientifically valid nor admissible, combined with Daubert challenges to other
pattern analysis fields of the forensic sciences, have produced a demand for
statistical support for the conclusions of the expert analyst. The experiment
presented here describes the confidence interval and relative accuracy of
the trigonometric calculation used in point-of-origin reconstruction for
bloodspatter patterns.
To best test the mathematic model, it was necessary to produce a large
number of stains at a known, constant angle. To this end, an apparatus was
built allowing for controlled replication of single droplet patterns in bovine
blood at a range of incident angles between zero and 80 degrees. The stains
were then measured by multiple researchers, both trained and untrained,
and the length and width measurements compared. These measurements
were used to calculate the angle of incidence using the formula ∠incidence =
cos -1 (d / D). The error of the calculated angle as compared to the recorded
angle was determined through scatterplots and other statistical analysis.
Results support the conventional wisdom that as the ratio of width to
length of the stain approaches 1.0 (impact angle approaches 90 degrees),
calculations become less reliable. The impact of even minimal training by
a qualified expert is demonstrated, and comparison of the range of calculated angles to the ideal calculated angle provides new insight into the
responsible use of the trigonometric model in the field.
Bloodspatter, Bloodstains, Statistics
54
B46
The Accreditation of College and
University Forensic Science Programs
Jay A. Siegel, PhD*, Indiana University, Purdue University, School of
Science, LD 326, 402 North Blackford Street, Indianapolis, IN 46202
After attending this presentation, attendees will learn how the process
of accreditation is carried out.
humanity by demonstrating how the quality of forensic science education
will be improved.
The American Academy of Forensic Sciences in conjunction with the
National Institute of Justice has begun a process for accrediting College and
University Forensic Science Programs by adopting a set of guidelines
developed by the Technical Working Group on Forensic Science
Education. This poster will show the process and procedures for
accreditation.
Forensic Science, Education, Accreditation
B47
Proof of a Negative?
H. Dale Nute, PhD*, Florida State University, 4750 Collegiate Drive,
Panama City, FL 32405
After attending this presentation, attendees will learn an approach to
teaching the concept of negative evidence to students or trainees using
crime scene search protocols as exemplars.
humanity by introducing forensic science practitioners and educators to the
concept of constructing a probability assessment for a crime scene search
protocol, in particular to the probability that a negative search can, under
the right circumstances, infer a probability that the evidence was not there.
Determining the error rate for many forensic science examinations is
relatively straightforward. For example, the probability of correctly:
identifying a compound, assigning a DNA pattern to its donor, and
reconstructing a vehicle’s speed at the time of an accident, have all been
considered. But, what if a crime scene search produces no evidence? What
is the probability that it really was there (merely overlooked) versus the
probability that it really was not there? What is the approach for calculating
the error rate for a crime scene search such that one can offer a reliable
assertion that an item of interest really was not there when its absence will
support an issue in the case, i.e., negative evidence? The reliability associated with locating, or assuring the absence of, an item of evidence is no
less trivial than the reliability associated with its examination. The question
then is, what is the probability that a particular search protocol will locate
(or miss) a particular item in a particular matrix at a scene?
This question is analogous to the concept of limit of detection in
toxicological analyses. And, like those tests, the answer depends on the
compound of interest, the matrix within which it is hidden, and the
technique used to detect it. But, unlike the relatively uniform approaches
associated with identifying chemical compounds in body fluids, the variety
in forms of evidence, types of matrices, and detection techniques that
comprise crime scene searches precludes simple solutions. Indeed, like
much of forensic science, the question can sometimes be answered quantitatively but more often it can only be answered qualitatively. Faced with
all of this complexity, the educational challenge is first to convey the
concept itself.
An approach is presented for teaching students how to consider the
question of presence versus absence. An exercise is constructed around the
task of locating small items, such as cartridge cases, in an outdoor plot. A
variety of search techniques is employed with the varying successes
recorded. From these data, a comparison can be constructed as to the
relative probabilities of finding the item of interest. One also can determine
the relative “cost” in terms of time and equipment required. These findings
* Presenting Author
lead to another question – What would be the increase in the probability of
finding the item(s) if two different techniques were employed instead of
just one? This question allows the instructor to introduce the idea of
Bayesian probability as applied to an examination, rather than just to its
impact on the case as is commonly presented. Considering a Bayesian
approach, though, requires a consideration of both false positives and false
negatives along with the usual consideration of true negatives and
positives. Using cartridge cases as an exemplar allows for plausible scenarios to be advanced in which a probability exists of finding items that
have nothing to do with the case at hand. This introduces the idea of
combining quantitative data from objective sources with “expert,” “background,” estimated, thus, subjective information. Although the students do
not have the skills, based on the exercise alone, to develop reliable data as
to a search protocol’s error rate, they know the procedure and have a better
understanding of what it takes to “prove a negative.”
Negative Evidence, Crime Scene Search, Protocol Error Rate
B48
Unusual Use of Modified Fire Debris
GC/MS Method to Analyze Hydrocarbons
Elzbieta J. Kubicz, PhD*, Wyoming State Crime Laboratory, 316 West 22
Street, Cheyenne, WY 82002
After attending this presentation, attendees will learn the adjustment
of known GC/MS analysis of fire debries to identify common hydrocarbons. This poster will present the unusual use of GC/MS method for
analysis of fire debris.
humanity by demonstrating easy modification of existing method to
analyse hydrocarbons.
Case History: The 4-year-old male was found unresponsive inside a
tent in the yard of his home. The 911 call was placed about 1:00 p.m. A
temperature reading was taken inside the tent, and registered 126°F. The
child was taken to egmergency room. The rectal temperature at that time
was 108°F. The child was pronounced dead at 1:39 p.m. Toxicologic evaluation identified Ethylbenzene and Xylene in a blood at 0.85 mcg/ml and
4.1 mcg/ml respectively. Cause of death was ruled acute intoxication.
The boy’s parents claimed that they were removing lice using “Ortho”
and “Hot Shoot” sprays.
To preserve the evidence, immediate analysis was needed. The child’s
bedding from the tent was subject to analysis to look for trace of Xylene
and Ethylbenzene.
Ethylbenzene, GC/MS, Xylene
B49
Reliability Testing of Commercial
Containers for Fire Debris Evidence Storage
Michael E. Sigman, PhD*, Mary R. Williams, BS, and Denise
Fernandes, BS, University of Central Florida, PO Box 162367,
Orlando, FL 32617
The goal of this presentation is to present results from a study on the
leak rates of ignitable liquids from commercial containers used for fire
debris evidence storage. This presentation will provide information on the
reliability of commercial containers as fire debris evidence containers and
methods for handling and analyzing the evidence.
* Presenting Author
humanity by presenting the results from this long-term study by monitoring
hydrocarbon retention in quart volume containers of metal cans, glass jars,
and polymer bags. Data revealing leak rates of the containers and the
behavior of the hydrocarbon vapors will be discussed along with the significance to methods in fire debris collection and analysis.
A common type of evidence collected at a fire scene is the debris
suspected of containing ignitable liquids. The total or partial loss of the
volatile ignitable liquids in a container subject to leaking can lead to an
altered hydrocarbon profile. Previous investigations have reported significant leak rates for various commercial containers primarily paint cans and
polymer bags. This study will differ from previous studies based on its
approach for determining the leak rates of the commercial containers for
fire debris evidence.
One approach utilized in this study was based on the ideal behavior of
a hydrocarbon solution in the C7-C10 range in accord with Raoult’s law.
Leaks in the container would result in a change in vapor phase composition
and a subsequent change in the mole fraction of each component in
solution. The more volatile components decrease first, and the change is
reflected in both the vapor and liquid phase compositions. The composition
of the vapor phase thus provides a way to directly monitor the weathering
of an ignitable liquid mixture. The composition of the headspace vapors of
the containers was monitored by repeated removal of small (c.a. 20 µl)
vapor samples from large (c.a. 1 gal.) containers through a septum inserted
into the container lid. The dynamic behavior of a mix of volatile hydrocarbons inside a closed container, coupled with vapor adsorption by the
portion of the septum exposed to the interior of the container complicated
analyte sampling and analysis. The statistical variation in the resulting data
did not allow for the determination of slow leaks in the containers.
A second method employed in this study was sampling by passive
headspace concentration with activated charcoal. This method utilized activated carbon strips to adsorb the hydrocarbon mixture then elute the hydrocarbons from the activated carbon with a solvent. Early experiments by this
method were complicated by the preferential adsorption of aromatic and
higher molecular weight hydrocarbons by the activated charcoal.
Extensive research into the adsorption properties of activated charcoal was
conducted1, and the results from the research provided a sampling methodology for monitoring the mole fraction of the C7-C10 hydrocarbon mixture
remaining in the container over an extended period of time. A set of four
types of quart volume commercial containers held for six different time
intervals are undergoing extended time testing. Containers subject to
induced leaking are under investigation as positive controls for observable
changes in the recovered hydrocarbon mole fraction in the presence of a
slow leak. Leak proof systems are under investigation as negative controls
against unanticipated changes in the adsorptive function of the activated
charcoal over long periods of exposure to hydrocarbon vapors.
The results from this long-term study by monitoring hydrocarbon
retention in quart volume containers of metal cans, glass jars, and polymer
bags will be presented. Data revealing leak rates of the containers and the
behavior of the hydrocarbon vapors will be discussed along with the significance to methods in fire debris collection and analysis.
References:
1. Mary R. Williams, B.S., Denise Fernandes, B.S., Candice Bridge, B.S.,
Derek Dorrien,
Stefanie Elliott, and Michael Sigman, “Adsorption Saturation and
Chromatographic Distortion Effects on Passive Headspace Sampling witth
Activated Charcoal in Fire Debris Analysis,” J. Forensic Science, 2004,
submitted.
Fire Debris, Ignitable Liquids, Trace Evidence
55
B50
Development of a Standardized Field
Portable Extraction Gas Chromatography
Tandem Mass Spectrometry Method for
the Analysis of Ignitable Liquid Residues
Marilyn Prieto*, Jeanette M. Perr, BS, Kenneth G. Furton, PhD, and José
R. Almirall, PhD, Florida International University, Department of
Forensic Chemistry and Biochemistry, 11200 Southwest 8th Street, CP
194, Miami, FL 33199
The goal of this presentation is to discuss the development of a field
portable extraction and standardized gas chromatography ion trap tandem
mass spectrometry (GC/IT/MS/MS) method for implementation in the
detection and identification of ignitable liquid residues (ILR).
humanity by increasing the sensitivity and selectivity that is necessary to
detect minute amounts of ILR remaining after a fire and to differentiate ILR
from IP. It is anticipated that the results using GC/IT/MS/MS will not
require sophisticated training, longer analysis times, or data analysis programs.
The discovery and recovery of small amounts of ILR in fire debris
evidence can be arduous owing to considerable loss of these compounds
during the fire, extraction techniques that are not the most sensitive, coextraction of interfering products (IP), and analysis techniques that
provide low discrimination. The main purpose of this project was to
optimize a general method that can be used by examiners to improve
current analysis of fire debris without significantly altering the workload
or time required for analysis. In order to accomplish this goal uniform ionization parameters had to be established as well as chromatographic parameters.
Uniform ionization regions, called bins (chromatographic references), were created using the standard n-alkanes, C8 through C23, as
markers. Alkanes elute from the gas chromatograph in a consequent order
depending on boiling point and other factors. The method utilizes an
alkane to produce bins that other ignitable liquids (IL) components elute
into. The optimized parameters that best fit the IL constituent bin were put
forth to evaluate components of interest away from IP thus weakening or
even excluding interferences. Distinctive fragments, such as adduct ions,
will be utilized to detect the alkane and label the bin. The bin method
designed an undiversified and concentrated ionization zone that will result
in reproducible mass spectra. Once the optimum MS/MS ionization parameters are selected for each bin, mass spectra will be compiled for IL components. Known IL standards and known weathered IL standards will be
tested to generate reference examples using the MS/MS detector through
the use of solid phase microextraction (SPME). These acknowledged IL
standards will be investigated in the presence of IP, thus exemplifying the
advantages, confirm the disadvantages, and establish the utility of this
method.
This method is expected to increase the sensitivity and selectivity
that is necessary to detect minute amounts of ILR remaining after a fire
and to differentiate ILR from IP. It is anticipated that the results using
GC/IT/MS/MS will not require sophisticated training, longer analysis
times, or data analysis programs.
Ignitable Liquid Residue, GC/IT/MS/MS, SPME
B51
Poking Holes in the Suspect’s Story:
An Overview of Pharmaceutical
Theft and Tampering Analysis
Angela S. Mohrhaus, BS*, Heather A. McCauley, BS, Nicola Ranieri, BS,
and John R. Urban, BS, Food and Drug Administration’s Forensic
Chemistry Center, 6751 Steger Drive, Cincinnati, OH 45237
The goal of this presentation is to present the forensic community with
an overview of the analytical approaches used by the FDA’s Forensic
Chemistry Center (FCC) in casework involving the theft of contents from
and/or tampering with pharmaceutical vials and syringes.
humanity by presenting examples as an analytical roadmap for those in the
general forensic chemistry community who may lack experience analyzing
similar pharmaceutical fraud/tampering cases.
This poster will highlight the approaches used by the FCC in cases
involving pharmaceutical theft and/or tampering. The FCC receives suspect
narcotic vial and syringe evidence from all over the U.S., and is often asked
to answer three basic questions: Has the integrity of the product container
been compromised? How much, if any, of the original product remains?
What, if anything, was used as a replacement medium (adulterant)?
The type of pharmaceutical theft most commonly encountered occurs
in hospitals and nursing homes where an individual removes a portion of a
narcotic solution from a vial or syringe. In most cases, the individual will
“replace” the contents removed with some sort of diluent, such as saline or
bacteriostatic water. The FCC has also received cases where the original
narcotic product was replaced with another, less potent narcotic. The
motive for using a less potent narcotic may be to minimize the chances of
the theft being discovered, as a patient receiving the less potent narcotic
would be less likely to complain about the pain medication not working.
When a suspect syringe or vial arrives at the FCC, its first stop is in
the Microscopy Lab. There the vials and syringes are examined for evidence of tampering and determination of what may have been used to
access and remove the contents of vials and syringes. Using both Polarized
and Stereoscopic Light Microscopy (PLM/SLM), the microscopists are frequently able to determine the number of times, for instance, a vial’s rubber
septum has been punctured. Excessive numbers of punctures can be
indicative of product theft, adulteration, replacement, or other types of
fraud. The shape and characteristics of the puncture hole(s) provides evidence as to what sort of tool was used to puncture the septum.
The next step in the process is GC-MS analysis. The contents of the
suspect vials and syringes are screened for the presence of the active ingredients, as well as any additional drugs or unusual components. If the contents appear to be diluted, this analysis may indicate what was used as a
diluent. For example, if benzyl alcohol (a preservative) is detected in the
suspect item using the GC-MS screen, but not the controls, bacteriostatic
water or saline may have been used for replacement.
After determining the composition of the vial/syringe contents, the
compounds present are quantified (if possible) by HPLC with UV detection
in order to determine the extent of dilution.
The final step, if necessary, in the analysis of these samples is elemental analysis. If during the GC-MS analysis it is determined that the
contents were diluted, ICP-AES analysis can be performed to evaluate the
contents for the presence of excess sodium relative to untampered control
pharmaceutical samples. The amount of excess sodium relative to the
dilution of the active pharmaceutical ingredient may be consistent with the
replacement of the stolen contents with saline.
Once all of the necessary analyses are completed, the pieces of the puzzle
start to fit together. Generally, the FCC can report back to the case agent with
the following information: how many times the suspect product was accessed,
what type of tool was used to access the contents, whether there is active ingredient remaining, whether another drug (or a potentially harmful substance)
was used in replacement, how much of each identified component is present
in the solution, and whether saline was used as the diluent.
Pharmaceuticals, Tampering, Theft
56
* Presenting Author
B52
Drug Profile of Urine Specimens
From Arrestees in Taiwan
Jui Hsu, MSEHS, Wen-Ing Tsay, MS, Chiareiy Liu, M.K. Kuang, MS,
Chun-Sheng Chien, and Jih-Heng Li*, National Bureau of Controlled
Drugs, Department of Health, #6, Linsen South Road, Taipei, 100,
Taiwan
Not only in the United State but also in Taiwan, using drugs are
criminal behaviors and the drug abusers have the tendency of using polydrug. From this presentation, attendee could learn, retain and even
implement into their practice about drug use and profile of urine specimens
from arrestees.
Drug abuse is a global phenomenon and its extent and characteristics
differ from region to region. This presentation describes the most common
combinations including MDMA identified were MDMA/ketamine and
MDMA/Methamphetamine use in Taiwan, and will impact the forensic
community and/or humanity by assisting forensic community to understand the poly-drug combinations.
Introduction: Drug abuse is a global phenomenon and its extent and
characteristics differ from region to region. Club drugs, MDMA, marijuana
and ketamine, have emerged in Taiwan in recent years. MDMA and ketamine positive rates as high as 76% and 47% from rave party participants
were shown by Lua et al. in 2001.1 Easy accessibility of precursors and of
manufacturing know-how, relatively low prices and the trendy and benign
image with popular techno-music and rave culture were all responsible for
the spread of MDMA, MDA and MDEA rapidly as reported by
UNODCCP in Global Illicit Drug Trends 2000. 2 In Taiwan, using drugs
are criminal behaviors and the drug abusers have the tendency of using
poly-drug which causes complicated and serious health problems owing to
its variety of combination. To understand the drug profile and the combinations of poly-drug use in Taiwan, the authors conducted a study of urine
drug testing on drug related arrestees who might commit crime(s) by using
drugs.
Experiments: 930 urine specimens were collected from police
arrestees suspected of drug abuse from twelve of the twenty-three counties
in the Taiwan island from Jan 2002 to July 2002. In this study, screened
urine specimens were screened with immunoassay reagents adapted to
Merck Selectra Vista II and Hitachi 705 automatic biochemistry analyzers
according to the manufacturer’s recommendations, then confirmed the
presence of morphine, codeine, methamphetamine, amphetamine, ketamine, MDMA and marijuana with GC/MS. At the meantime, REMEDi
HS Drug Profiling System was used to screen for the other drugs. Thirtynine drugs were identified positively in 930 specimens.
Results and discussion: The REMEDi HS system is widely used in
hospital emergency rooms to identify poisons in a patient’s urine or serum.
It is highly automated and fast with a potential to screen over 900 drugs and
metabolites, including stimulants, local anesthetics, antidepressants, antibiotics and pesticides. In this study, specimens were screened for more than
100 drugs out of the over 200 on Taiwan’s controlled drug list. The drugs
include benzodiazepines, barbiturates, synthetic opiates and stimulants.
Morphine and methamphetamine were verified as still the major drugs
detected in Taiwan, followed by Benzodiazepine (18.3%), MDMA (17.7%)
and ketamine (7.2%). Complicated poly-drug use patterns were observed
and up to six drugs or metabolites were detected in some specimens which
included methamphetamine, benzodiazepine, opiate, precursor, MDMA,
MDA and ketamine. The most frequently identified drug combinations
were morphine/Methamphetamine (19%), Codeine/Methamphetamine
(15%), morphine/amphetamine (15%) and morphine/benzodiazepine
(13%). The most common combinations including MDMA identified were
MDMA/ketamine and MDMA/Methamphetamine.
Conclusion: Morphine and Methamphetamine were verified as still
the major drugs of abuse in Taiwan, followed by Benzodiazepines, MDMA
and ketamine. Ketamine and benzodiazepines were detected at high rates
and became a significant problem. Also for the drug combinations, of
* Presenting Author
ketamine positive specimens, MDMA was most frequently identified and
of benzodiazepines positive specimens, morphine, methamphetamine and
opioid were found mostly. The detection rates for THC and barbiturates
were low in arrestees. These results revealed important information for
further research and policymaking.
Reference:
1. Lua, A.C., Lin, H.R., Tseng, Y.T., Hu, A.R. and Yeh, P.C. 2003. Profile
of Urine Samples from Participants at Rave Party in Taiwan: Prevalence
of Ketamine and MDMA Abuse. Fore. Sci Intl. 136: 47-51.
2. UNODCCP: United Nations Office for Drug Control and Crime
Preventions, Studies on Drugs and Crime: Global Illicit Drug Trends,
2000.
Arrestee, MDMA, Urine Specimens
B53
A Blind Trial Evaluation of a Practical
Methodology for Deducing Impact
Velocity and Droplet Size From Bloodstains
Lee Hulse-Smith, MS*, King’s College London, Strand Campus, London,
WC2R 2LS, England; and Mike Illes, Ontario Provincial Police: Forensic
Identification, 453 Lansdowne Street, East, Peterborough, Ontario K9J
6X5, Canada
After attending this presentation, attendees will learn the blind trial
results of a novel technique that utilizes bloodstain diameter and number of
spines to derive droplet size and velocity
humanity by providing boodstain pattern analysts a methodology that could
calculate droplet properties such as size and velocity. Upon the discovery
of a bloodstain that meets the criteria (circular with radiating spines), investigators could derive the impact velocity and droplet volume and utilize
these variables to:
1. Infer bloodshed forces by correlating impact velocity with an
assault instrument.
2. Determine release height of passive droplets impacting on
horizontal surfaces.
3. Incorporate projectile motion into trajectory calculations for
bloodstains discovered on non-horizontal surfaces.
Crime scene reconstruction is dependent on the ability to establish
past events from present variables. Investigators now have a method for
uncovering droplet properties from bloodstains, leading to a more accurate
interpretation of the crime scene.
Bloodstain diameter and number of spines are independent variables
that can be combined to solve for impact velocity and droplet volume. This
was established in a prior experiment that utilized mechanical engineering
models to solve droplet properties from pig bloodstains. A blind trial study
was subsequently undertaken to test the accuracy of this technique using a
redesigned crime scene methodology.
Bloodstains found at the scene of a violent crime can often be used to
reconstruct the events surrounding bloodshed. However, reconstruction
would be enhanced if bloodstain morphology could be used to infer droplet
properties. Investigators could then determine the source-of-origin and the
forces surrounding bloodshed more accurately. At present, droplet properties are lost upon impact with the surface. As a result, a classification
system based on stain diameter has been adopted to dissuade investigators
from using bloodstains to estimate droplet properties.
Attempts have been made to correlate impact velocity with stain
diameter. However, this has proven difficult since the size of a bloodstain
is a function of two unknown variables (droplet size and velocity).
Alternatively, Balthazard et al. was interested in using bloodstain spines to
solve for impact velocity. Spines are commonly found radiating from the
periphery of stains, and range in appearance from waves to sharp protrusions. As with stain diameter, Balthazard discovered that spines alone
could not predict impact velocity, due to the additional influence of droplet
57
volume. He concluded that a deeper understanding of droplet dynamics
was required. Several mechanical engineering models that have since been
developed show a predictable relationship between stain morphology
(diameter and spines) and droplet properties (size and velocity).
In a previous study, Hulse-Smith et al. evaluated two mechanical
engineering models for their ability to predict droplet size and velocity
from bloodstains. Pig blood droplets were released over a range of
diameters (3.0 - 4.3mm) and impact velocities (2.4 – 4.9m/s) onto four
surfaces (glass, steel, plastic, paper). The resulting bloodstains were then
used to predict droplet properties. A strong correlation was found between
observed and expected results.
To determine if this technique would translate to the crime scene, a
redesigned methodology was tested under blind trial conditions. An investigator was presented with images of human bloodstains and samples of
each impact surface. The conditions used to create each bloodstain were not
revealed. The investigator subsequently performed a calibration to derive
two specific equations for each surface. This aided in eliminating any variation introduced by surface irregularities. Finally, the number of spines and
stain diameter were quantified from each unknown bloodstain image and
integrated into the respective equations to solve for droplet properties.
Experimental results are revealed during this presentation.
Bloodstain Pattern Analysis, Blood Droplet, Spines
B54
Paradoxical Effects of Surface
Structure and Drop Height on
Blood Stain Pattern Formation
Mark Benecke, MSc, PhD*, and Saskia Reibe, BSc, International
Forensic Research & Consulting, Postfach 250411, Cologne, 50520,
Germany; Philip von Doetinchem, BSc, Technical University of Aachen,
c/o International Forensic Research & Consulting, Postfach 250411,
Köln, 50520, Germany; Petra Boehme, BSc, University of Bonn, c/o
International Forensic Research & Consulting, Postfach 250411, Köln,
50520, Germany; Andreas Scholten, BSc, and Alexandra Schulz, BSc,
University of Cologne, c/o International Forensic Research & Consulting,
Postfach 250411, Cologne, 50520, Germany; and Melanie Gericke, KK,
Police Academy Hamburg, c/o International Forensic Research &
Consulting, Postfach 250411, Cologne, 50520, Germany
influence of surface structure on shape of blood drops is very hard to
predict without extensive experimentation. Even if surfaces seem to be
very similar, paradoxical effects occur. Systematical variation using the
actual surface from a crime scene will still allow scientifically sound statements, e.g., relating to height of blood source. Ultra-high-speed
photography and physical analysis of the edges of blood stains during their
process of formation (Karsten Loehr, Université Pierre et Marie Curie,
Paris) also help to understand the dynamics between the surface, the blood
drop and its later shape.
humanity by demonstrating how extensive experimentation is necessary to
understand the influence of the actual environment on the shape of blood
drops. Even very reasonable and obvious assumptions about the structure
of a surface may easily lead to wrong interpretations, and wrong expert
witness statements.
During casework, the authors encountered the problem that height of
the blood source became relevant. In order to determine the dependence of
different types of underground on the shape of the drops, the authors
checked the influence of asphalt, paper, linoleum, and plastic against
different dropping heights (5, 100, 250, 500, 1000, 2000, and 3000 mm; n
(drops) = 520). Then the diameter of the stains was compared, the number
of fingers, the maximum distance of satellite drops to the center of a stain,
and the total number of satellites.
58
Initially, asphalt and paper produced effects of rough surfaces whereas
linoleum and plastic represented rather smooth surfaces. However, the
general tendency of the diameter to increase with drop height, and to
remain constant beyond a certain height, was not observed on asphalt.
Instead, the diameter remained constant irrespective of drop height.
Also, the number of fingers (“noses”) of stains produced on asphalt
did not increase like on the other surfaces. The largest number of fingers
was observed on paper.
The maximum distance of satellites to their central stain mostly
increased linear with drop height. Asphalt presented the largest distances.
Drops on the plastic surface showed constantly small distances of the satellites to the center of the stain.
Exact total number of satellites could only be determined on paper and
asphalt. Even though both materials showed properties of the rough surface
group, they produced very different results (e.g., on asphalt, the number of
satellites increases linearly and steeply with height). In contrast, on paper
the number of satellites stayed nearly zero.
In many cases it also seemed as if the relationship between height and
the respective measured parameter was initially not linear but exponential,
inverse exponential, or following a saturation curve. These effects will only
become visible if small intervals between drop heights are chosen experimentally, especially in the often neglected range between 0 and 100 cm.
Conclusion: In casework, extensive experimentation is necessary to
understand the influence of the actual environment on the shape of blood
drops. Even very reasonable and obvious assumptions about the structure
of a surface may easily lead to wrong interpretations, and wrong expert
witness statements.
Blood Stain Pattern Formation, Crime Scene Reconstruction, Physics
of Drop/Surface Interaction
B55
ESCRIME: A New Software for Bloodstain
Pattern Analysis in 3-Dimensions
Philippe Esperanca, MS, and Yves Schuliar, MD*, IRCGN, 1, Boulevard
Théophile Sueur, Rosny-sous-Bois, 93110, France; Pascal Chaudeyrac,
MSFS, B. Piranda, and Didier Arques, PhD, Université de Marne la
Vallée, Section Informatique, cité Descartes Champs-sur-Marne, MarneLa Vallée Cedex 2, 77454, France
The goals of this presentation are to explain the possibilities and the
use of a software created to reconstruct 3-D trajectories of bloodstains at
crime scene.
humanity by presenting a new tool to deal with bloodstain pattern analysis
at the crime scene.
Today, bloodstain pattern analysis is a fully recognized forensic discipline. The shape of stains assists investigators in determining the point of
origin when locating the victim and the assailant during the bloodshed. The
data obtained are very helpful to confirm witnesses or suspects statements
and to support the investigators assumptions.
The forensic science laboratory of the French Gendarmerie and Marne
La Vallée computer University created a new software called ESCRIME.
The function of ESCRIME is to assist investigators with the interpretation
of bloodstain patterns by bringing together three functions.
The first one is to create a virtual 3-D crime scene according to the real
furniture and different textures observed. It is possible to know very
precisely (within millimeters) the exact location of each item.
The second deals with the exploitation of the pictures of bloodstains.
It is important to extract exact information and to measure a stain and locate
it at the scene.
The third one allows the software to calculate the half plan the stain
pass by and to determine point of convergence. The user can easily move
inside the crime scene to obtain different views in 3-D.
* Presenting Author
The authors will present real cases using the software in real time.
ESCRIME is not only useful for bloodstain pattern analysts but also
for other crime scene specialists, and can help to present cases to the court.
Bloodstain Pattern Analysis, Computer Analysis, Crime Scene
Reconstruction
B56
Identification of Benzimidazolone Organic
Pigments in Automotive Coatings Using
Pyrolysis Gas ChromatographyMass Spectrometry
spectral overlap issues that occur when using FTIR. Py-GCMS also
provides information about the polymeric binder or film former.
Organic Paint Pigments, Automotive Coatings, Pyrolysis Gas
Chromatography-Mass Spectrometry
B57
Environmental Effects on Automotive
Polyurethane Coatings: Implications
for Casework
Vincent J. Desiderio, BS*, and David Gardner, BS, New Jersey State
Police Office of Forensic Sciences, Central Laboratory, 1200 Negron
Road, Hamilton, New Jersey 08691
Janice L. Hellman, MSc, and Gavin R. Edmondstone, BSc*, Centre of
Forensic Sciences, 25 Grosvenor Street, Toronto, Ontario M7A 2G8,
Canada; and Katrina L. Bernardin, BSc, Forensic Science Unit,
University of Strathclyde, 204 George Street, Glasgow, Scotland G1 1XW,
United Kingdom
humanity by presenting a proposal for an alternate means of identifying
benzimidazolone organic pigments in automotive coatings.
Automotive coatings frequently play an important role in investigations of vehicular accidents, including “hit and run” incidents. When an
automobile hits an individual, another vehicle, or an inanimate object, some
portion of the vehicle’s paint is often left behind. This evidence can serve
two purposes: 1) If a suspect vehicle is located, a comparison of any questioned paint from the scene or victim to the known paint from the vehicle
can be performed; and 2) If a suspect vehicle is not available, any paint left
at the scene or on the victim may be useful for developing investigative
leads. Of the two possibilities listed above, this paper is primarily
concerned with the latter.
In order to provide investigative leads, the questioned paint must be
examined physically and chemically. Chemical analysis of the paint
evidence should be carried out in such a way so that as many of its
individual components may be characterized as possible. The results should
then be compared to a comprehensive database to determine whether a
possible make, model, and year of suspect vehicle can be ascertained. The
collaborative efforts of the Royal Canadian Mounted Police (RCMP) and
FBI (FBI) have provided the forensic science community with such a
database in the form of the Paint Data Query (PDQ).
The PDQ is based on the input of data obtained from visual, elemental
and spectroscopic analysis of questioned samples. Generally, as more
components of questioned paints are identified, the discrimination potential
of such evidence increases. With recent shifts away from inorganic
pigments, which often contain heavy metals such as Pb and Cd, organic
pigments have become more prevalent in automotive coatings. Therefore
the identification of organic pigments would be advantageous in generating
a shorter list of possible suspect vehicles.
In its current state, the PDQ does not include organic pigments in its
identification scheme. This absence may be due in part to a lack of research
in this area. It has recently been shown that organic pigments can be identified in automotive paints using Fourier Transform Infrared Spectroscopy
(FTIR). However, in certain instances the relatively low concentrations of
organic pigments typically found in automotive coatings may make it
difficult to make an identification using FTIR alone. In addition to the
problem of low concentrations of organic pigments, automotive coatings
frequently contain inorganic pigments, flakes and fillers that tend to
obscure the presence of the lower levels of organic pigments when using
FTIR.
To address this problem, this research was undertaken to evaluate the
use of Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GCMS) as
a compliment to FTIR for the identification of organic pigments. PyGCMS can provide lower detection limits so that certain problematic
organic pigments may be conclusively identified. This technique also
provides for a cleaner separation of the contributions of the organic
components from those of the inorganic components, thus offsetting the
The goal of this presentation is to present the infrared spectral
variability that can occur within the same automotive polyurethane
clearcoat to promote a better understanding of how this can influence
casework for paint examiners.
humanity by showing paint examiners why it is important to fully characterize polyurethane clearcoats when conducting a comparison analysis of
this material. In particular it is important to sample at various depths from
the surface or at least to sample at a consistent depth from the surface.
Without proper consideration of the internal variability of these coatings
incorrect exclusions could be made.
Chemical variability within automotive polyurethane clear coats has
been observed in casework at the Centre of Forensic Sciences. These
chemical variations were observed in the infrared spectra as differences in
the relative intensity of the prominent band at 1690 cm-1 with respect to the
1730 cm-1 carbonyl band. The differences in intensity appeared to be
dependent on the depth from the surface in automotive paints. A common
technique of sampling clear coats for IR analysis is to manually slice thin
peels, a method that does not permit the depth of sampling to be carefully
controlled. This could contribute to the variation, and cause difficulties in
interpreting a paint comparison.
It has been documented in the literature that polyurethane paints
degrade upon prolonged exposure to UV radiation and water. The chemical
changes due to the photo oxidation of these coatings have been studied
using infrared and UV spectroscopy. However, in these instances the
degradation process was initiated using weathering simulations. It is not
known to what extent this degradation occurs under normal exposure to the
environment and whether it would vary depending on the location on the
vehicle. It has also been reported that the presence of water vapor during
the curing process can create depth dependant variability in the
polyurethane film. This may also account for the spectral variations
observed.
Determining the extent of chemical variation that can occur within
polyurethane automotive clear coats of real automobiles (not test panels)
would be useful for interpreting these variations when they occur in
casework and for developing sampling strategies. Polyurethane clear coats
are used extensively as automotive repaints and to a lesser extent as OEM
(Original Equipment Manufacture) clear coats, thus they are frequently
encountered in cases that require analysis of automotive paint.
Differences of the relative intensities of infrared bands that appear to
be reproducible could be interpreted as a differentiating feature between
two paints. However, if these differences are due to internal variability of
the coating that is not adequately represented then it is not a true difference.
Thus, variation within the polyurethane clear coats could cause problems
when interpreting infrared data especially when working with very small
samples.
Polyurethane clear coats were obtained from a variety of automobiles
and were analyzed using Fourier transform infrared spectroscopy to
* Presenting Author
59
determine the chemical variations within these paints. Chemical changes
in the polyurethane clear coats were assessed as a function of depth
(distance from the surface) by the examination of cross-sectioned samples
by infrared micospectroscopy. Differences over different locations on the
automobile were examined using attenuated total reflectance spectroscopy,
which is a surface sensitive technique. Distinct chemical variations were
observed both as a function of depth, and of location on the vehicle in a significant minority of the samples investigated. These differences could lead
to an erroneous interpretation. While demonstrating the spectral variability
within a clear coat is time consuming it can be essential to achieving a
correct interpretation.
The data from this analysis will be presented and the implications of
these findings on data interpretation and sample preparation will be
discussed.
Automotive Paint, Polyurethane, FT-IR
B58
Characterization of Automobile Body Fillers
Jay A. Siegel, PhD, Indiana University, Purdue University, School of
Science, 402 North Blackford Street, Indianapolis, IN 46278; Sara
McNorton, MS*, 2544 Chilver Road, Windsor, Ontario N8W 2V9,
Canada; and Guy Nutter, BS, Michigan State Police, 42145 West Seven
Mile Road, Northville, MI 48167
characterization of auto body fillers by instrumental means.
humanity by providing forensic scientists a mean to compare and
characterize body fillers will be greatly increased.
The objective of this study was to determine if chemical and physical
differences in body fillers from various manufacturers exist and could be
identified. Extensive research was done to obtain a representative sample
of automobile body fillers and spot putties used in the U.S. After all of the
samples were identified, 33 samples were obtained. Twenty-four of the
samples were body fillers and 9 were spot putties. Nine different
companies manufactured the 33 samples. All of the samples were analyzed
by FTIR microscopy, stereo microscopy and pyrolysis GC-MS. The results
of the analysis showed that 13 of the 33 samples could be correctly
identified as to source, while the rest of the samples could be put into
groups containing 2-4 types.
Automobile, Body Fillers, Spot Putties
B59
Beyond the Barcode: The Electronic
Product Code and the Future of
Product Identification
Max M. Houck, MA*, 886 Chestnut Ridge Road, PO Box 6216,
Attendees will learn about the electronic product code (EPC), the
object naming system (ONS), and how the coming tide of product identification technology, such as radio frequency identification (RFID), will
affect their ability to identify products and track manufacturers.
humanity by providing forensic scientsts with an understanding of the
coming systems of product identification, such as the EPC and the ONS, to
better identify products that are submitted as evidence and track the product
to its manufacturer or even its point of sale. Without an awareness of this
information, crucial evidence to a case may be neglected or lost.
Just as the UPC code has transformed retail operations around the
globe over the past twenty years by increasing productivity and efficiency
within the supply chain, the EPC (electronic product code) could take
60
supply chain dynamics to the next level. The EPC is a new product numbering standard under development by the Uniform Code Council (UCC)
that can be used to identify a variety of items using radio frequency identification (RFID) technology. The 96-bit EPC code links to an online
database, providing a secure way of sharing product-specific information
along the supply chain. Like other RFID solutions, the EPC’s ability to be
read without a line-of-sight offers users significant savings to manufacturers and retailers.
The existing UPC code allows retailers to track products at the SKU
(stock keeping unit) level by providing every product with a unique
identifier. The UPC (and its International cousins, the EAN and JAN) is
made up of two key components: a number which identifies the manufacturer of the product, and a number which identifies the product belonging
to that manufacturer. Each time a new product is created, or an existing
product is modified in any way (including changes in packaging), a new
UPC code is assigned to the product. Since each product may go though
several minor design/packaging changes over its life, a single product may
end-up with several UPC codes that identify it to a retailer, even though the
retailer may consider the product as a single SKU.
The EPC technology, in conjunction with the expanding production of
RFID capable printers/encoders, has the potential to revolutionize the
supply chain by providing more accurate information about product
movement, stock rotation, inventory levels and other management information. It also would be a significant tool for product recalls and theft
prevention.
A consortium of companies (including WalMart, Proctor and Gamble,
and Sun) is currently supporting research into this new technology.
The EPC code is a new product numbering standard that goes way
beyond identifying products. The EPC assigns a unique number to every
single item that rolls off a manufacturing line—that is, every single bottle
of soda would have its own unique EPC number. The EPC will allow
every company in the supply chain, including retailers, to track products at
the individual item level. This means every single item on a shelf could be
traced back to when it was made and when it is sold. However, the
structure of the EPC does not necessitate every retailer track items at this
level. The EPC has been designed to allow it to replace the UPC and allow
tracking at the SKU level if desired. Because of the enormous quantity of
unique numbers required to track at the item level, the EPC utilizes a
“96-bit numbering scheme.”
The implications to forensic science are enormous—the ability to
track products that appear as evidence back to their point of sale! It is
critically important that forensic scientists become aware of this new
technology, how it works, and what resources are available to keep tabs on
this groundbreaking technology.
Barcodes, Product Identification, Electronic Product Codes
B60
Forensic Science and Homeland Security:
A Critical Piece of the Puzzle
Barry A.J. Fisher, MS, MBA*, Scientific Services Bureau, Los Angeles
County Sheriff’s Department, 2020 West Beverly Boulevard, Los Angeles,
CA 90057
State and local crime labs, for the most part, are unprepared to provide
assistance in terrorism acts or mass casualty incidents.
humanity by providing attendees with a clearer understanding that State
and local crime labs are not part of a nation preparedness strategy.
Attendees will also receive suggestions on how to remedy this situation in
their home regions.
Suppose terrorists mount coordinated attacks across the United States
and abroad striking many targets simultaneously. Historically, the FBI,
FEMA, D-MORT teams, and other organizations provide assistance to
local agencies during disasters with or without mass casualties. But what
* Presenting Author
would happen if the federal response were stretched so thin that local jurisdictions were on their own for a few days or longer? Naturally, the “locals”
would fend for themselves and manage as best as they could.
A serious problem exists today. There is no defined role for State and
local crime labs who employ thousands of trained scientists throughout the
United States in the event of a terrorist incident. Despite their wide use in
other areas, local crime labs have largely been ignored as an added resource
for homeland security related incidents. The result is that few state or local
crime labs are prepared to help out should an incident occur. The idea that
forensic science personnel might be among the first responders or support
first responders has not been fully considered. Developing a local forensic
science response to a terrorist incident while it is unfolding is not the
appropriate time to start planning.
While crime labs do not have the capacity to specifically handle
certain types terrorist incidents as certain Federal agencies they, none-theless, in a WMD scenario, they will play a role, whether they are prepared
or not. The events in New York City following September 11, 2001,
demonstrate this when the NYC Office of the Chief Medical Examiner conducted thousands of DNA tests for victim identification.
State and local public safety personnel will be involved with pre and
post terrorist events. It is no leap to expect local forensic science personnel
to also be involved as either first responders or immediately following the
first responders. They could be involved at the scene and in the laboratory
as examiners of physical evidence in traditional forensic science efforts
such as, DNA testing, latent fingerprint examination, handwriting examination, and so on.
Before forensic scientist show up at a scene or become involved,
careful consideration will be given concerning chemical, biological, radiological and nuclear contamination of evidence, analysis of large volumes of
evidence, tracking evidence, coordinating information, training and
preparedness.
To date, federal planners that would ultimately manage terrorist
incidents have not considered what might be the appropriate role for State
and local forensic science laboratories in terrorist incidents. Other than
medical examiners and coroners, there have there been few attempts to
prepare local forensic practitioners for this assignment.
What are appropriate steps that might be taken to remedy the present
situation? Just as the Department of Health and Human Services has
brought state and local public health labs together under a “laboratory
response network” an appropriate federal agency should bring together
state and local crime labs along with homeland security stakeholders to
develop a role for state and local forensic science laboratories and begin
planning how to use these resources.
A national forum is one way to define the relationship of forensic
science to homeland security. Some of the issues that might to be discussed
include: the identification of mass casualties by DNA; the examining
WMD contaminated evidence at the crime lab; the coordination of local
crime labs with state and local public health labs; training and equipping
forensic science personnel; and integrating forensic science into WMD
preparations.
State and local crime labs can also begin preparations now by contacting local stakeholders concerned with terrorism and mass casualty
planning. Sometimes it takes the prodding of the “locals” to get the “fed”
moving. And now would certainly be a good time to begin, before the next
incident occurs.
Terrorism, Homeland Security, Mass Casualties
* Presenting Author
B61
Bioterrorism in Europe After
September 11th: Our Experience
in BIOTOX Procedure
Thierry W. Faict*, and Stéphanie W. Neel, MD, Faculté de Médecine,
CHU de Clermont-Ferrand, 28, Place Henri DUNANT, ClermontFerrand Cedex 01, 63001, France
humanity by showing the forensic community that forensic scientists
should be involved in bioterrorism for many reasons among which are the
protection of the population of penal evidences
At the end of 2001, the United States of America was hit by incredible
acts of terrorism. In the months and years following, small groups have
tried to increase the stressful climate by using militarized “harmless”
bacterial strain. The effects of globalization allowed a wild distribution, not
of the bacterium, but of fear, especially in Europe and analysis on different
supports suspect to be infected are being perfomed today.
The authors are showing here the impact and the experience of a
forensic ward in the fight against bio terrorism.
Systematic bacteriological and judiciary analysis of suspect postal
dispatches in France from October 23, 2001 to July 2004 are exposed.
Bacteriological and toxicological results, as well as penal consequences for
the authors have been studied. The administration sought to implement this
procedure for sanitary and economical reasons and for penalty proof
protection as well. More than 250 analyses were performed and no anthrax
was found.
The organization of this procedure, its history and difficulties are
presented. The techniques and bacteriological methods used will be
analyzed. Methods implemented in order to preserve judicial proof are also
presented along with the difficulties in relation to their qualification for
efficient penal procedures.
Bioterrorism, Anthrax, Europe
B62
Census of Publicly Funded
Crime Laboratories - 2002
Joseph L. Peterson, DCrim*, Department of Criminal Justice, University
of Illinois at Chicago, 1007 West Harrison Street, Chicago, IL 60607; and
Matthew J. Hickman, MA, Bureau of Justice Statistics, 810 Seventh Street,
NW, Washington, DC 20531
By attending this presentation, attendees will receive an overview of
a recently completed census of the nation’s publicly funded crime
laboratories.
humanity by providing forensic laboratories and policy makers with crime
laboratorie’s staffing patterns and caseload characteristics, as well as their
resource needs.
This presentation will provide laboratories and policy makers with
crime laboratories’ staffing patterns and caseload characteristics, as well as
their resources needs.
The Department of Criminal Justice at the University of Illinois at
Chicago (UIC), in collaboration with the American Society of Crime
Laboratory Directors (ASCLD), was funded by the Bureau of Justice
Statistics (BJS) to undertake a census of all publicly funded crime laboratories throughout the United States. Because this was to be a census,
responses were sought from every, individual crime laboratory in the
nation. UIC was asked to gather baseline statistical information for 2002
on the operations and workload of crime laboratories, and to assess where
added resources were needed. The objective was to improve public understanding of the work performed and resources committed to crime
laboratories.
61
Staff worked extensively with ASCLD and the crime lab community
to develop a comprehensive listing of laboratories. The survey itself had
six primary areas: Organization, Budget, Staff, Workload, Outsourcing,
and Quality, Training, & Research. First the governmental entity and
population of jurisdictions served was determined, and types of forensic
functions performed in each laboratory. Next, the budget breakdown of
each laboratory was examined, and source of funding. We then determined
laboratories’ workloads and queried labs about the number of cases
received and backlogged, and the volume of requests received, worked and
backlogged in 2002. Also determined was the performance expectations
that laboratories had of various examiner specialists, and what added
resources would be needed to reduce backlogs. Questions were asked about
the number of requests outsourced, as well as the cost and funding sources
for such testing. Lastly, laboratory accreditation was determined, the types
of proficiency tests in which they were engaged, and the dedication of
resources to training and research. Facilities had the option to respond
either via paper or electronic form.
The process began with a mailing list of 469 facilities that were
queried to ascertain if they met the definition of a publicly funded crime
laboratory. Ultimately, 126 entities were excluded that were either
duplicates, bad addresses, or did not meet the definition of a laboratory;
e.g., many crime scene and police ID units were excluded. Three hundred
forty three (343) laboratories remained on the list as bona fide crime
laboratories. Once it was determined that all survey responses from all
laboratories willing to complete the primary survey were received, an
abbreviated (short) survey was developed abd directed to the remaining,
nonresponding laboratories. Two hundred eighty-six 286 full and 25 short
(partial) surveys were received from participants – a total of 311 individual
laboratory responses, representing a response rate of about 90%. Also
received were 15 aggregate responses representing multiple laboratories in
state or federal systems.
Data were initially compiled and published via a BJS Fact Sheet for
the fifty largest state and local laboratories in the United States. These
facilities employed more than 4,300 full-time equivalent (FTE) personnel
in 2002 and had budgets exceeding $266 million. Laboratories received
almost one million cases in that year, including over 1.2 million requests for
forensic services. The requests represented about half of all requests for
forensic services handled by publicly funded laboratories nationally. These
labs ended the year with over 93,000 backlogged cases including about
270,000 requests for forensic services – more than twice the backlog that
existed at the beginning of the year. It was DNA analysis were backlog was
increasing the fastest; i.e., for every DNA analysis request completed in
these laboratories in 2002, an estimated two requests were added or
remained outstanding at yearend. A summary of all data collected will be
presented at the meeting.
Crime Laboratories, Survey, Backlog
B63
Biotracks – Leveraging DNA Technology
to Solve Lesser Offense Cases and Reduce
Recidivism in Queens County, New York
Denis McCarthy, MA, MBA, W. Mark Dale, MBA, and Lisa Faber, MFS*,
New York Police Department Laboratory, 150-14 Jamaica Avenue,
Jamaica, NY 11432; Charles S. Hirsch, MD, Office of the Associate Chief
Medical Examiner, 520 First Avenue, New York, NY 10016; Mitchell M.
Holland, PhD, and Michael Cariola, MFS, The Bode Technology Group,
7364 Steel Mill Drive, Springfield, VA 22150; and Charlotte J. Word,
PhD, and Mark D. Stolorow, MS, MBA, Orchid Cellmark, 20271
Goldenrod Lane, Germantown, MD 20876
The objective of this presentation is to demonstrate the value of
recognizing and collecting various types of biological evidence left at burglary scenes. By generating STR profiles from evidence such as perspiration, hair, and blood, and uploading them into local, state, and federal
62
DNA databases, the perpetrator(s) of a no-suspect case may be identified
and links between otherwise unrelated burglaries may be established. By
maximizing the potential and effectiveness of the DNA databases, this
study demonstrates a means of identifying the recidivism rates of convicted
offenders within a specific geographical region, as well as identifying any
correlation between burglaries and more violent crimes such as sexual
assault and homicide.
Research has shown that virtually all offenders begin their criminal
careers early in life with lesser offenses. A 2002 study by the Bureau of
Justice Statistics shows that burglars had one of the highest re-arrest rates
at 70.4% as well as one of the highest recidivism rates for specialists
i.e., prisoners who, after being charged with one type of crime, are likely to
commit the same type of crime again. Considering that there are over
110,000 convicted offender DNA samples in the New York State database
to date, the authors felt it was time to leverage this technology and focus on
lesser offenses such as burglary in order to reduce their frequency and
ultimately reduce the frequency of more violent crimes.
In order to ensure that the most probative items of biological evidence
are collected and analyzed, it is essential to have a well-trained and
informed evidence collection team. In addition to targeting conventional
items such as cigarette butts, blood, soda cans, and hair, the burglary scene
processors in Queens County, New York were trained to recognize and
swab contact surfaces such as windows, knife handles, and door knobs
which may contain trace amounts of biological material left behind by
intruders. Instruction in the protection of these biological samples from
contamination, loss, or deleterious change was a key aspect in the training.
This presentation will conclude by discussing which types of
biological evidence and contact surfaces yielded the most informative STR
profiles and how many profiles were developed from specific types of
items. With this type of data, law enforcement will gain a better understanding of which items from a burglary scene are likely to yield probative
profiles and how many samples need to be collected and analyzed. By
obtaining STR profiles from biological evidence left at burglary scenes and
utilizing the expanding DNA databases of convicted offenders, the rate of
burglaries and more violent crimes can ultimately be reduced.
Burglary, DNA, Database
B64
Development of Improved DNA Extraction
Method for Detection of Biological Threat
Agents Collected on Environmental Swabs
Richard Winegar, PhD*, Coridon Quinn, BS, Oscar Ruiz, PhD, and
Jennifer Wolack, BS, Midwest Research Institute, 1470 Treeland
Boulevard, Palm Bay, FL 32909; Douglas Anders, PhD, FBI Hazardous
Materials Response Unit, 2501 Investigation Parkway, Quantico, VA
22135; and Kevin W.P. Miller, PhD, FBI Laboratory, Counterterrorism
Forensic Science Research Unit, Building 12, Quantico, VA 22135
Attendees will learn an improved method for recovering and detecting
DNA from biological threat agents collected on environmental swabs.
humanity by demonstrating that sensitive detection can be achieved by
using an integrated approach for sample processing that considers recovery
of agent from the sampling matrix, release of DNA, counteracting environmental inhibitors, concentration of extract, and robust PCR conditions.
Investigations of crimes involving dangerous biological agents often
require the use of swabs and wipes to recover the biological evidence.
Current laboratory protocols for rapid extraction and detection of Bacillus
anthracis (BA) from environmental swabs often rely on the recovery of
DNA present on the external surface of spores. Furthermore, these
methods generally do not include ways to counteract environmental PCR
inhibitors except for dilution of the original DNA sample. As a result, these
methods can suffer from poor sensitivity of detection. Additionally, such
methods for extraction of spore DNA may not be appropriate for extraction
* Presenting Author
of nucleic acids from other biological threat agents such as viruses. This
study was conducted to determine whether the sensitivity of detection can
be increased by incorporating steps for lysis, DNA purification, and
optimized PCR conditions.
An extraction method was developed which consists of placing a
swab head inoculated with microorganisms into a 2 ml O-ring screw-cap
tube containing lysis buffer, glass beads and polyvinylpolypyrrolidone.
The microorganisms were lysed by bead-beating and the DNA extracted
and purified using the Qiagen DNeasy kit. To counteract the effect of
environmental PCR inhibitors, molecular biology-grade bovine serum
albumin (BSA; 200 ng/mL) was included in the PCR reaction.
In order to evaluate this method for extraction of nucleic acids from
various types of microorganisms, real-time PCR assays were developed for
the detection of DNA from BA (a Gram positive bacterium), Yersinia pestis
(YP; a Gram negative bacterium), Vaccinia virus (VAC; an enveloped
virus) and Adenovirus (ADV; an un-enveloped virus). Using this
extraction method, the reliable lower limit (10/10 extraction replicates
showing positive results in duplicate PCR reactions) of detection by realtime PCR is 100 colony forming units (cfu) of BA spores and 100 plaque
forming units (pfu) of Vaccinia virus inoculated directly onto clean, sterile
swabs. In order to mimic dirty or dusty environmental samples, swabs
were coated with 10 mg of urban particulate matter (NIST SRM 1648)
prior to inoculation with microorganisms. Real-time PCR detection
following DNA extraction from these dirty samples resulted in reliable
lower limits of detection of 500 cfu BA and 100 pfu VAC. Despite the
apparent poorer detection limit of BA in dust-coated swabs, 100 cfu could
be detected in a majority (95% of extraction replicates and 90% of PCR
replicates) of the samples tested. Similar studies are underway to determine
the limits of detection for YP and ADV.
In conclusion, the authors have developed a method for the efficient
extraction and sensitive detection of BA and VAC DNA from environmental swabs. Future studies will focus on the recovery and detection of
other organisms and development of extraction methods for other sampling
matrices.
consists of a sample digestion step followed by purification and concentration with a microcon 100 (Millipore). Moreover, this procedure can be
automated through the robotic removal of the digested DNA from the swab
and transfer to the microcons, assembled into a 96 well plate, the Microcon
96 Retentate® Assembly Plate (Millipore). The Dacron® and cotton swabs
tended to clog the pores of microcons hindering sample concentration.
Moreover, the microcon elution volumes were inconsistent, often unnecessarily diluting the samples.
Since the microfiber also had some problems with liquid retention,
additional candidate fibers were selected based on their high absorption
potential coupled with the likelihood that their structure promoted fluid
release. A series of five analogous, natural fabrics (A-E) were evaluated for
potential use for the LCN swab. Fabrics A and B have similar shapes, but
had few variations in their weaves, whereas fabrics C, D and E had different
shapes, but had few variations in their weaves. To test absorbance, the
fabrics were immersed in 10 uL of control DNA in a microfuge tube. When
the tube appeared dry, the fabrics were discarded and water was added to
the tubes to resuspend any DNA left behind. In order to test the release of
DNA, control DNA was deposited directly onto the fabrics, and allowed to
be absorbed into the fabric for ten minutes. The fabric was then placed in
sterile water and shaken at room temperature for 20 minutes. Following
sample concentration, DNA was measured and the percent recovery was
calculated. Based on the results, Fabric B and Fabric C were superior. To
confirm this finding, fingerprints were collected from volunteers, and were
swabbed with each of the two fabrics. Comparable yields resulted.
Subsequently, the fabrics were compared with respect to their performance with the robotic system. Prior to this testing, the optimal length of
the fabrics for DNA recovery was determined, although, regarding
robotics, the smallest length possible is best. Lengths of 1 cm, 2 cm and 3
cm were used to swab dried cells from a surface and extracted. Fortunately,
the shorter lengths of fabrics yielded the most DNA. Therefore, the sample
digests were removed from Fabrics B and C on the Biomek 2000.
However, Fabric B caused a malfunction whereas Fabric C was compatible
with the process, and was selected as the candidate swab fabric.
Microbial Forensics, DNA Extraction, Biological Threat Agents
LCN samples, DNA, Automation
B65
B66
Evaluation of Fabrics for Development
of a Low Copy Number Sampling Swab
James A. Sebestyen, BS*, Mechthild Prinz, PhD, Robert Shaler, PhD, and
Theresa A. Caragine, PhD, Office of Chief Medical Examiner, 520 First
Avenue, New York, NY 10016
The goal of this presentation is to compare different fabrics that were
tested in the development of a swab for the High Sensitivity Laboratory.
humanity by developing a swab to improve recovery of DNA from Low
Copy Number DNA samples such as fingerprints. The shape of this swab
also accommodates robotics, and thus promotes the processing of large
numbers of evidentiary samples.
In order to maximize the recovery of DNA from surfaces potentially
containing Low Copy Number (LCN) DNA samples, such as fingerprints,
several fabrics were evaluated based on their ability to absorb and subsequently release cells. These fabrics were also compared regarding their
compatibility with the laboratory’s high throughput system.
Studies conducted previously tested a wide variety of commonly
available fabrics including but not limited to cotton, polyester, and
microfiber, and Dacron® and cotton swabs, which are currently utilized for
sample collection. Initially, microfibers recovered the most DNA from fingerprints. Cotton and Dacron® absorb liquid very well, and their poor
DNA yield from LCN samples suggests that they trap DNA and liquid
within their fibers.
The Dacron® and the cotton swabs were also not compatible with the
optimized extraction protocol, unlike the microfiber swab. This procedure
* Presenting Author
Effect of Lubricants and Nonoxynol-9
Exposure on Biological Evidence
From Condom
Ginger Luccero, MFS, and Ismail M. Sebetan, MD, PhD*, Forensic
Science Program, National University, 11255 North Torrey Pines Road,
La Jolla, CA 92037
Attendees will further their knowledge when dealing with biological
evidence exposed to lubricants and spermicides due to use of condom in
sexual assault cases. The presented information will provide a starting point
for further research on utilization of the rate at which nonoxynol-9 degrades
the sperm cell membrane to help in determination of time of incident.
humanity by demonstrating research to those working in the field that will
further their knowledge when dealing with biological evidence exposed to
lubricants and spermicides due to use of condom in sexual assault cases.
The presented information will provide a starting point for further research
on utilization of the rate at which nonoxynol-9 degrades the sperm cell
membrane to help in determination of time of incident.
Condom use during sexual assaults has increased and, as a result, so
has the forensic significance of condom-associated biological samples.
Preservation of this valuable evidence has prompted the investigation of
condom lubricants and spermicides for potential degradation of biological
samples. Integrity of samples can be inferred by the ability to amplify short
tandem repeats (STRs) on the Y chromosome. Y chromosome STRs are
male-specific and are polymorphic in the number of times a sequence motif
is repeated. As a result, Y chromosome STRs provide a great power of
63
discrimination among individuals. It is important to prove that lubricants
and spermicides from condoms do not decrease the accuracy of DNA profiles, and therefore, do not undermine the validity of such evidence in court.
Semen samples were incubated at room temperature and at 37° C for
up to three days in the presence of a water-based lubricant, an oil- based
lubricant, and the spermicide nonoxynol-9. Untreated samples were also
investigated for comparison. Samples were harvested for DNA, which
served as a template for PCR and quantitative PCR (qPCR). PCR targets
included DYS 385, DYS 389I, and DYS 393 loci. For studying rate of
degradation of the sperm cell membrane, Semen samples were incubated in
condoms in the presence and absence of nonoxynol-9. Nonoxynol-9 (N-9)
is classified as a nonionic surfactant and interacts with lipoproteins of cell
membranes. Through a time course, samples were fixed with 4%
paraformaldehyde and stained with propidium iodine (PI). Cells were
sorted on the Guava PCA cell sorter and the percentage of PI negative cells
(viable cells) and the percentage of PI positive cells (non-viable cells)
were calculated.
Successful amplification of all DNA samples was demonstrated
through qPCR analysis as well as gel electrophoresis of PCR products.
Results also indicated that, over time up to three days, the percentage of
viable cells decreased in N-9 treated samples but stayed constant in
untreated samples.
In conclusion, it has been proven that exposure of semen samples to
oil-based lubricants, water-based lubricants, and nonoxynol-9 does not
prevent successful Y-STR. In addition, by determining the percentage of
viable cells in a sperm sample, the length of exposure to N-9 can be
estimated
DNA, Y-STR loci, Lubricants & Spermicides
B67
Optimization of DNA Extraction Procedures
for Low Copy Number Degraded Samples
Taylor M. Dickerson, MS*, Mechthild Prinz, PhD, Robert C. Shaler, PhD,
and Theresa A. Caragine, PhD, Office of Chief Medical Examiner, 520
First Avenue, New York, NY 10016
Attendees will learn modified versions of common DNA extraction
procedures that can be used for low copy number degraded samples
humanity by providing optimized procedures to ensure that a high yield of
DNA is obtained when a LCN degraded sample is encountered. Ultimately,
a higher yield of DNA from the extraction will provide more DNA for
amplification.
As LCN degraded samples are encountered more frequently in
forensic casework, it would be useful to optimize current DNA extraction
procedures in order to obtain a higher yield of DNA. The following DNA
extraction procedures were investigated: DNA IQ (Promega), QIAamp
(Qiagen), 5% Chelex® (BioRad), and a LCN extraction procedure
developed at the Office of Chief Medical Examiner with the use of 0.01%
SDS. Initial experiments were performed with purified DNA in amounts
of 100 pg or less. The DNA was degraded with DNase I and subjected to
each of the four extraction procedures, before and after optimization.
Human embryonic kidney cells were also degraded with DNase I; and
known amounts (~20 cells) were used in each of the extraction procedures.
Bloodstains that were degraded with irradiation were also used in this
study. As a control, LCN undegraded samples of the same nature were subjected to each extraction procedure, before and after optimization. All of
the samples were quantitated with real-time PCR, amplified with the Power
Plex 16® (Promega) multiplex system, and separated with the 3100
Genetic Prism® Analyzer (ABI).
For the DNA IQ (Promega) extraction procedure, the following
parameters were changed to optimize the extraction of the LCN degraded
samples: smaller volumes of resin and lysis buffer, shorter incubation time,
and the addition of Poly A RNA. For the QIAamp (Qiagen) extraction
64
procedure, the addition of Poly A RNA and an increased temperature during
the elution step optimized the extraction. The extraction procedures with
5% Chelex® and 0.01% SDS both gave optimal results with shorter incubation times. DNA yield, or percentage recovery, was calculated for each
extraction. The results from the optimized procedures were compared to
those before optimization. An increase in DNA yield was seen with all of
the optimized procedures. Usable DNA profiles were obtained for all of the
samples subjected to the optimized procedures.
DNA Extraction, Low Copy Number, Degraded DNA
B68
DNA Extraction of Archived Palm Prints:
Implications for Cold Case Evidence
Jason Berger, MS*, Mechthild Prinz, PhD, Robert C. Shaler, PhD, and
Theresa A. Caragine, PhD, Office of Chief Medical Examiner, 520 First
Ave, New York, NY 10016
Attendees will learn how DNA can be extracted from archived palm
prints, allowing for the genereation of CODIS compatible PCR DNA
profiles. DNA considerations for the collection of palm print evidence.
humanity by showing how archived palm prints, which may be too
smudged or incomplete for traditional fingerprint identification, can be
used for PCR DNA typing. This method could allow for the examination
of cold cases in which this type of evidence is present. Obtaining a CODIS
profile could allow for another way to identify a suspect.
The goalof this presentation is to improve the recovery of DNA and
the production of PCR DNA profiles from palm prints that have been
dusted with soot based fingerprint powder, and archived by tape lifting.
Archived latent prints are often the only probative evidence in many
unsolved cases. Employing protocols previously developed for Low Copy
Number (LCN) DNA samples by the High Sensitivity Team in the laboratory of the OCME, the DNA recovered from tape lifts of fingerprints was
often insufficient to produce DNA profiles that could be compared to the
national database, CODIS. Therefore the extraction method was optimized
and applied to archived palm print evidence, in order to maximize DNA
recovery.
Samples were collected from ten different subjects on two types of
surface (Linoleum tiles and Plastic). Subjects, at least one hour after
washing their hands, were asked to press both of their palms onto each
surface for five seconds. The prints were then dusted using both black and
dual-use fingerprint powders. Following enhancement, the prints were
lifted from the surface using a clear adhesive tape and stored on a standard
fingerprint lift card. In order to diminish the adhesive properties of the tape,
the cards were stored in the freezer at -20° C for at least four hours prior to
extraction.
The tape was then removed from the card to allow the digestion
buffer, 5 mls of 0.01% SDS and Proteinase K, access to the epithelial cells
attached to the tape. Thirty minutes was sufficient to digest the cells, yet
still preserve the DNA. Samples were purified and concentrated with a
centriplus 100 (Millipore) followed by a microcon 100 (Millipore) with the
addition of Poly A RNA to prevent loss of DNA. DNA recovery was measured with SYBR Green I and real time amplification of an ALU sequence.
All samples containing at least 6 pg of DNA were amplified for 35 cycles
with PowerPlex® 16 (Promega) PCR reagents with a halved reaction
volume and a doubled extension time. 4 µL of each PCR product was
injected at 3 kV for 20 seconds on the ABI 3100 Genetic Prism® Analyzer.
Data is expressed as the percentage of correctly determined alleles out of
the possible thirty-two alleles amplified.
Twenty eight palm prints were collected and archived from six different subjects. At least 6 pg of DNA was recovered from 64.3% of these
samples. This DNA was amplified to produce allelic determinations that
were 57.4% correct. However, many of these samples were multi-component mixtures. Since extraction of the tape alone produced DNA alleles,
* Presenting Author
the source of this contamination could be due to prior handling of the
adhesive edges of the rolls of tape. Therefore, the middle of the tape
containing the print was excised and extracted. Control pieces from the
center of the tape did not contain extraneous sources of DNA.
Consequently, fifty more palm prints were processed with two
methodologies to accommodate contamination from the tape. Half of the
prints were collected as described above, but only the middle portions of
the tape lifts were digested. Alternatively, the remaining prints were
collected on tape that was UV treated prior to sample collection. Similar to
the previous study, 65% of these samples contained at least 6 pg of DNA.
However, these experiments demonstrated a significant decrease in
the number of drop-ins. The non UV-treated tape averaged 46.34% correct
alleles with 5.3 spurious alleles called, and the UV-treated tape produced on
average 52.2% correct alleles with 15.2 spurious alleles. Furthermore, in
order to generate reliable profiles, samples were amplified twice, and
alleles were assigned only if they were occurred in both amplifications.
Employing only concurrent correct allelic determinations, usable database
eligible profiles were apparent, on average, in thirty percent of the samples
examined.
These studies suggest that archived palm and likely fingerprints may
provide DNA evidence. In order to avoid sources of contamination,
collection tape could be treated with UV and the DNA analyst should only
process the center of the tape. Regarding archived prints from cold cases,
the latter strategy is feasible, but depending on collection precautions,
mixtures should be anticipated.
Low Copy Number DNA, Tape Lifts, Finger/Palm Prints
B69
Select Agent Microbial Forensic
DNA Identification Techniques
Susan W. Jones, PhD*, Richard P. Schoske, PhD, Stephen Francesconi, PhD,
Lynn Cooper, PhD, Michael Dobson, PhD, and Robert Crawford, PhD,
Armed Forces Institute of Pathology, 6825 16th Street, NW, Washington,
DC 20306
After attending this presentation, attendees will have knowledge about
select agent microorganisms, DNA quantitation, and microbial DNA
identification techniques.
humanity by providing information about microbial forensic DNA
identification techniques used in laboratories for the DNA identification of
dangerous bacteria that are encountered in bioterrorist incidents.
The microbial select agents that have been historically been
weaponized in foreign nations and that pose the greatest bioterrorist threat
include Bacillus anthracis spores, Yersinia pestis, Francisella tularensis,
Burkholderia mallei, Brucella abortus, and Clostridium botulinum toxin,
however, any microorganism or toxin can be used to create public chaos
and fright in an act of biological terrorism or as a hoax. These microorganisms are cultured in a Biological Safety Level 3 (BSL3) biological
containment laboratory, require special care in handling due to their pathogenicity, and are highly regulated in an effort to prevent further acts of
bioterrorism.
Microbial class characteristics, such as gram stain reaction, cell
morphology, biochemical metabolic profiles, presence of spores and toxin
production are examined in microbial forensic analyses of organisms
released in a terrorist incident or hoax. Knowledge of select agent (SA)
microorganisms most likely to be used as biological weapons based on historical use, recent terrorist incidents involving SA microbes, and the need
for more rapid identification of these microorganisms, has prompted the
quest for informative DNA identification tests.
Microbial DNA identification tests require microbial strain population
studies to assess the specificity, the informative value of the DNA assay for
strain differentiation, and if source attribution of a strain is possible.
Therefore, large repository of well characterized select agent microor* Presenting Author
ganisms for the production of microbial genomic DNA for PCR assay
comparison studies is being grown in the laboratory of the AFIP.
Information on microbiological characteristics of the select agent genus and
species, genomic information, as well as any published information is also
being collected. Sensitive, specific microbial PCR techniques, performed
on specimens submitted for DNA identification, are based on detection of
unique genes that are present in quantified microbial DNA and can be
detected whether or not the microorganism is viable.
Various molecular biology techniques that have been used in the
laboratory for microbial DNA identification include 16S ribosomal DNA
sequencing, Amplified Fragment Length Polymorphism Polymerase Chain
Reaction, Multi-locus Variable Number of Tandem Repeat Polymerase
Chain Reaction, and Real-Time PCR amplification/detection of pathogen
specific genes. The strategy of using combined microbiological and molecular biology techniques allows confident DNA identification, but not
source attribution of select agent microorganisms.
Bioterrorism, Microbiology, DNA Identification
B70
An Improved Method for the Identification
of Menstrual Blood Using Real Time PCR
Martin Bauer, MD*, and Dieter Patzelt, MD, Institute of Legal Medicine,
University of Wuerzburg, Versbacher Street 3, Wuerzburg, 97078,
Germany
Attendees will learn that it is possible to identify the menstrual origin
of blood stains using real time PCR and that the question whether blood
stains were produced by injury or by menstrual bleeding can be of crucial
importance in forensic casework.
humanity by demonstrating a reliable method is available which allows the
detection of menstrual blood markers in blood stains. Compared to a
previously published paper the new technique is based on real time PCR, is
much more specific and senstive and therefore suitable for the use in
forensic casework.
In forensic casework type and origin of stains frequently are of crucial
importance. Whereas presumptive or specific tests exist e.g. for blood and
semen, the question whether a stain was produced by injury or by menstrual
bleeding remained unsolved over many years. Some time ago a new
technique was introduced based on the detection of mRNA by reversetranscription coupled to PCR. The evaluation of potential candidate genes
showed that matrix metalloproteinases were suitable markers for menstrual
blood and never were positive when blood from injuries or other body
fluids was examined (Martin Bauer, Dieter Patzelt. Evaluation of mRNA
markers for the identification of menstrual blood. Journal of Forensic
Sciences 2002; 47:1278-1283).
During the last years the authors have had the opportunity to do some
casework for police agencies in Germany and Great Britain. When
confronted with “real” stains produced outside the laboratory it became
evident that the sensitivity of the method was not sufficient because it had
been only tested with artificial stains up to that time. Furthermore, an
improved visualisation method with the possibility of quantifying results
seemed to be helpful because it frequently was difficult to assess bands in
agarose gels stained with ethidium bromide when their fluorescence was
very weak. For these reasons, researcher decided to re-establish the test
using real time PCR and sequence-specific probes which promised to be
the perfect solution for the problems mentioned above. The use of
Taqman®-probes allowed to amplify very short fragments with a size of
less than 50 bp and the detction of the fluorescent dyes coupled to the
probes is much more sensitive and specific than the assessment of agarose
gel bands with the naked eye.
Commercially available and self-designed primers and Taqman®probes for Matrix Metalloproteinases and house keeping genes were used
with samples left over from previous studies and from the cases submitted
65
for examination. In addition, 60 new samples from healthy volunteers have
been collected. RNA isolation and reverse transcription were performed as
described previously; however, as primer for reverse transcription now
random hexamer primers were used instead of an oligo-(dT)-primer.
Results again confirm that the detection of mRNA specific for Matrix
Metalloproteinases is a specific and sensitive indicator for the presence of
menstrual blood. The use of real time PCR allowed amplification of
RNA/c-DNA even in small and degraded samples using primers and probes
for housekeeping genes which were negative with the conventional technique. This is particularly important because casework experience showed
that it can be essential not only to prove that a given sample is menstrual
blood but to state that it is not menstrual blood. With the new technique it
is now possible to do this with a reasonable degree of certainty due to the
sensitive and quantitative detection of housekeeping gene-mRNA.
Negative result can be clearly differentiated from positive results due to the
continuous monitoring of fluorescence during PCR.
In this presentation the authors want to introduce the new technique
and to show that now reliable and consistent results can be obtained from
stains of minimal size and high degradation as it often happens in forensic
practice. To demonstrate the relevance of this test casework examples will
be presented in which the identification of menstrual blood played an
important role in police investigations.
Menstrual Blood, Real Time PCR, mRNA
B71
Methodologies to Employ Porcine Tissue to
Simulate Human Tissue: Determining the
Efficacy of Radiation for Decontamination
and the Subsequent Recovery of DNA From
Tissue for PCR DNA Testing
Theresa A. Caragine, PhD*, James A. Sebestyen, BS, Ewelina J.
Badja, BS, Robert C. Shaler, PhD, and Mechthild Prinz, PhD, Office of
the Chief Medical Examiner, Department of Forensic Biology, 520 First
Avenue, New York, NY 10016
The goal of this presentation is to describe assays designed to measure
DNA recovery and STR profiles from porcine tissue in order to provide a
model to test decontaminated human remains.
humanity by presenting studies which suggest that decontamination of
human tissue by irradiation is a possible solution for the safe return of
reamins to families. Moreover, these methodologies for porcine tissue
provide an easily accessible model for other examinations that may require
human tissue samples.
Currently, there are few viable alternatives regarding the identification
and subsequently the interment of biologically or chemically contaminated
human remains. Studies have demonstrated that irradiation of human
tissue, specifically at 51 kGy, destroyed Bacilus subtilis, a surrogate for
Bacillus anthracis, but preserved identifying DNA sequences. Chemical
decontamination, however, will likely require much higher doses of
radiation. Therefore, the laboratory of the OCME in conjunction with Titan
Corporation performed a dose response with electron beam radiation and
evidentiary items such as blood, semen, and saliva stains. Even at doses as
high as 90 kGy, sufficient DNA to produce usable DNA profiles was
recovered, although the absolute DNA yield was compromised. In order to
better define the limits of DNA testing of irradiated samples, and to assess
penetration through a large tissue sample, pork slabs, simulating human
tissue, were irradiated at higher doses, and methodologies were adjusted to
accommodate this porcine DNA.
Inserting dosimeters deep within a substantial piece of pork addressed
the issue of radiation penetration. With the effective dose known, one could
evaluate DNA testing results taken from a pork sample proximal to a
dosimeter, with certainty. Moreover, the efficacy of decontaminating tissue
66
could be studied with pork similarly “inoculated” with spore test strips for
Bacilus subtilis.
In this experiment, six pork shoulder shanks were sliced into four one
pound slabs of boneless meat. A small portion of each of twenty slabs was
sliced wherein one dosimeter and one spore strip, sealed in waterproof
miniature kpac pouches, were inserted. The gap was sewn together with
fishing line, and wrapped in brown bench paper. Two slabs of pork thus
prepared were packaged in each of ten boxes, where one slab was placed
near the bottom of the box and one near the top. Sandwiched between the
two slabs were an additional dosimeter and a spore strip. Surrounding
these items were dry ice and newspaper.
Titan Scan, San Diego, CA, irradiated two boxes for each of the
following doses: 0 kGy, 30 kGy, 60 kGy, 90 kGy, and 120 kGy. The
dosimeters and the spore strips were returned to Titan Scan and Raven
Laboratories, respectively, for processing. Three 25 mg samples of each of
twenty slabs of pork were extracted with DNA IQ™ (Promega) according
to a modified methodology developed in the laboratory on the Biomek
2000 that encompassed the use of a stronger digestion buffer and three
times more resin than recommended.
DNA recovery was measured with a SYBR Green I based real time
PCR assay for ALU fragment. Primers described by J Walker et al.
(Analytical Biochemistry, 2003) produced a 134 bp amplicon. The assay
was modified for the Rotorgene 3000 and a home brew master mix with the
addition of 0.5 g/ L of BSA, 8% DMSO, and 0.25 L of a 1/100 dilution
of SYBR Green I (Molecular Probes). The dynamic range of the assay was
from 0.78 pg to 6400 pg. The control DNA for the standard curve was
procured from control slabs of pork that were extracted as described above,
and measured with a spectrophotometer.
Amplification of the ALU amplicon predicted successful genotyping
of porcine microsatellites. Three microsatellites from the USDA database,
Sw520, S0147, and TNFB, were selected due to their varying lengths, 102124 bp, 146-174 bp, and 174-213 bp, respectively. Each forward primer
was labeled with 6’FAM, and collectively they were multiplexed according
to the parameters described by G. Yue et al. (Electrophoresis, 1999) with
additional KCL. PCR products were separated on an ABI Genetic Prism
Analyzer using LIZ (ABI) as a size standard. DNA recovery and STR
typing results were similar to previous experiments. Although, as radiation
increased DNA recovery decreased, if sufficient DNA was present genotypes were generated.
Radiation, Microsatelites, Animal Model
B72
Determination of the Distribution of DNA to
the Faces of Children Aged 0-5 Years Due to
Normal Day-to-Day Interaction Between the
Child and the Carers
Victoria L. Bowyer, MSc, Eleanor A.M. Graham, MSc*, and Guy N.
Rutty, MD, MBBS, Forensic Pathology Unit, University of Leicester,
Robert Kilpatrick Clinical Sciences Building, Leicester Royal Infirmary,
Leicester, Leicestershire LE2 7LX, United Kingdom; and Sabine Maguire,
and Beverley Ellaway, Dip Child Protection, Cardiff University, First
Floor Academic Centre, Llandough Hospital, Cardiff, Wales CF64 2XX,
United Kingdom
After attending this presentation, attendees will learn that it is possible
to obtain DNA from the skin surface of a child which can be amplified and
identified and that this varies from child to child as well as at different ages.
The attendee will also learn how DNA can vary in distribution across the
face and neck of a child.
humanity by demonstrating how upon completion of phase I and phase II
of this research, a series of facial maps will be produced illustrating the
distribution of DNA upon the faces of children aged 0-5 years. As childcare
* Presenting Author
varies as the child ages these maps can be used as a template for
determining how much or little DNA is transferred as the level of care
changes. Variation in cases of abuse can then be investigated further with
a view to determining exactly who is responsible.
The goal of this presentation is to provide information on the normal
distribution of DNA present on a child’s face and neck for those aged 0-5
years due to the normal day-to-day interaction between the carers and the
child.
Hypothesis: That it is possible to retrieve DNA from the face of a
physically abused child in order to determine the perpetrator of the abuse.
However, to date no one knows what the normal distribution of self and
non-self DNA upon the face of children is due to the daily activities of the
child for example from carer child interaction or child-child interaction.
This is the first study of its type to investigate the normal deposition of
DNA on the faces of children aged 0-5 years.
In Britain every year three million children are victims of abuse.
Many are too young or too frightened to indicate who is responsible.
Victims of physical abuse are generally under the age of 5 years with the
highest mortality rates being observed in those under 3 years old. Without
witnesses to the event it may be impossible to identify the perpetrator and
therefore prosecute them. A method of identifying the individual responsible for physically abusing the child is critically required.
It is hypothesised that when an individual hits a child some of the
offenders DNA will be transferred onto the child’s skin. However, before
this can be confirmed one needs to know what is the normal distribution of
DNA on a child. To date no information is available. The aim of this study
is to provide that information for children aged 0-5 years. In order to do
this the study examines the presence of DNA other than that of the child on
the face, its distribution and its source. It considers in the presence of nonchild DNA whether this has arisen from the normal day to day interaction
between the carer and the child. By studying children aged 0-5 years and
considering the care of children and how the interaction between the carer
and the child alters at each milestone it is possible to provide facial maps
of the normal distribution of DNA found on the faces of children. This can
then be considered if DNA is retrieved in the investigation of abuse in
whether the DNA present is outside that of the normal handling pattern of
the child at that age group.
For the purpose of the study a facial map was designed which divided
the face and neck into 12 sections. Sterile, moist swabs were used to swab
each area of the face using a number of techniques. The techniques for the
swabbing of children aged 0-5 years were developed such that the children
could tolerate the process and yet it avoided contamination by the person
undertaking the sampling. All swabs were anonymised, frozen and transported to a non-police laboratory for independent analysis. DNA was
extracted from the swabs using Chelex and was quantified using Oligreen
ssDNA Quantitation kit (Molecular Probes, OR, USA). DNA was
amplified and analysed using AmpFlSTR SGM Plus PCR
Amplification kit, ABI PRISM 377 DNA Sequencer, Genescan and
Genotyper (Applied Biosystems, CA, USA).
Results from phase I and phase II of a three phase study considered
the facial distribution of 80 children. Each facial area showed an average
quantity of DNA from the swabs less than 100ng, making accurate
quantification difficult. Partial genetic profiles were obtained from the
majority of the areas of the face, which were consistent with arising from
the child. Extraneous alleles were observed in some areas, particularly the
neck and cheeks. These partial profiles had not arisen from the child or
from the person undertaking the sampling process. The results show that it
is possible to obtain identifiable genetics profiles from the face using
simple swabbing techniques designed within the study protocol. Facial
maps for each age are being produced to show the distribution of the
observed profiles.
DNA Transfer, Children, Facial Mapping
* Presenting Author
B73
A New High Throughput Easy to
Use Differential Extraction Method
Allan Tereba, PhD*, Laura Flanagan, BS, Paraj Mandrekar, MS,
and Ryan Olson, BS, Promega, 2800 Woods Hollow Road, Madison,
WI 53711
After attending this presentation, attendees will to introduce to the
forensic community a new differential extraction method that can rapidly
and efficiently separate sperm and epithelial cells in a high throughput
format.
humanity by demonstrating a new differential extraction method that will
significantly reduce the amount of time needed to process a major fraction
of violent crime sample types thus allowing more cases to be solved
without increasing personnel. The high throughput method will allow the
use of automation and will finally provide a means to significantly reduce
the large backlog of sexual assault evidence.
One of the main reasons for the large backlog of sexual assault
samples is the difficultly in working with the evidentiary material. Typical
vaginal swabs contain a mixture of victim epithelial cells in large excess
over sperm cells. Unprocessed, these samples can only be analyzed using
male specific markers that provide important evidence but are of limited
use in searching national databases due to the inheritance and nonrecombinatorial nature of the Y chromosome.
In 1985, Gill et al. developed a method to enrich for sperm cells in the
presence of an excess of epithelial cells. This process relies on the fact that
sperm structural proteins as opposed to epithelial cells contain a large
amount of disulfide bonds that inhibit the proteolysis of these proteins.
After a controlled proteolysis in the absence of a reducing agent, the sample
is centrifuged in a spin basket to remove from the solid matrix intact sperm
and solution containing the DNA from lysed epithelial cells. Because the
resulting sperm pellet contains loose cell debris a considerable amount of
contaminating solution is left and must be diluted out with serial washings
and centrifugations. This process is time consuming and results in loss of
sperm and variability between examiners.
The authors have developed a new differential extraction method that
takes advantage of the nearly two decades of experience using the standard
differential extraction. After a standard Proteinase K digestion of the
sample, the solid support and DNA-containing solution are centrifuged
through a special material that effectively separates the sperm from soluble
DNA and cell debris. The samples are washed once without centrifugation
to remove any remaining soluble DNA in the sperm fraction. DNA IQ™
Lysis Buffer containing DTT is then added to the epithelial and sperm
fractions. This buffer effectively lyses the sperm without need for further
Proteinase K digestion. The total time for separating the sperm from
epithelial cells following addition of the sample to the Proteinase K
Digestion Solution is approximately 1 hour 20 minutes which includes the
1-hour Proteinase K digestion. The purification of the DNA requires 40
minutes so the total separation and purification can be accomplished in 2
hours.
Because the same standard Proteinase K digestion and initial
centrifugation is used to help remove the sperm from the solid support and
to lyse the epithelial cells, the efficiency of these steps will be identical to
what is currently available. However, only one centrifugation is required
for efficient separation so the sperm recovery is better. In addition, the
hands on time as well as the overall time needed to do the separation has
been greatly reduced from the current method. Data will be presented on
the sensitivity and successful processing of old samples.
Although the new differential extraction method significantly reduces
the time to process samples, there is significant time spent in transferring
samples to new tubes following the digestion step. The centrifugation of
samples in a single tube format also does not mesh with current automation
methods. To increase the throughput of this method plasticware has been
developed that allows the incubation and subsequent centrifugation of
67
samples in the same 96 deepwell format. This eliminates transfer steps
where contamination can occur and makes the method fully compatible
with current robotic methods. The use of this plasticware also allows the
efficient extraction of reference samples on buccal swabs and blood cards
to be performed with the same chemistry in the same plate as the sexual
assault samples if desired. The time to process a full 96 well plate of
samples using this new differential extraction method coupled with
automated DNA IQ™ purification on a Biomek® 2000 workstation is
approximately 4 hours of which only a small fraction of this time requires
manual intervention.
Differential Extraction, High Throughput, Automation
B74
The Efficacy of Sample Pre-Selection
in High Volume DNA Analysis
Kimberley Sharpe, MSc*, Kelly Jo Walden, MSc, Roger Frappier, MSc,
and Jonathan Newman, BSc, Centre of Forensic Sciences, 25 Grosvenor
Street, Toronto, ON M7A 2G8, Canada
The goal of this presentation is to describe the benefits of identifying
acceptable sample types for analysis, with high likelihoods of success in
generating crime scene DNA profiles amenable for upload to the National
DNA Databank, in a high-volume casework program.
humanity by demonstrating the efficacy of sample selection in high volume
casework and the success of obtaining DNA profiles from high-volume
casework
Due to caseload pressures and the volume of break and enter occurrences, these cases have had a lower priority, in the forensic community,
than more serious crimes. With the advent of the National DNA Databank
(NDDB) in Canada and with a recent increase in trained staff, the Centre of
Forensic Sciences (CFS) developed a program for the analysis of DNA
break and enter cases where no suspect has been identified. The objective
was to provide information that would assist investigations of this nature,
where no other avenues existed.
When the program was launched in October 2001, only blood swabs
were examined and only one swab per case was analysed. In August 2002,
the program was expanded to include a greater range of sample types where
DNA evidence stood to be recovered. This included a variety of samples
such as cigarette butts, chewing gum, and swabs from discarded drinking
containers.
As of July 2004, approximately 2500 cases had been processed.
Approximately 62% of the samples submitted were blood swabs. Of the
remaining cases, a significant proportion included swabs from drinking
containers (19%), cigarette butts (15%), and other miscellaneous items
(4%). This review summarizes the success rate in obtaining a DNA profile
from the variety of samples tested, excluding blood.
The following results indicate the percentage of samples yielding a
complete (AmpFlSTR® Profiler Plus™ system) STR DNA profile:
cigarette butts (94%), swabs of drink containers (66%), chewing gum
(100%), worn clothing with no apparent body fluid samples (32%), and
miscellaneous samples such as envelopes, hair, nasal samples, and scene
swabs reportedly from saliva (63%).
The success of the program is exemplified by the proportion of
samples yielding a profile suitable for upload to the National DNA
Databank (i.e., a profile with at least 6 of 9 AMPFlSTR® Profiler Plus™
loci). The data show that on average approximately 81% of the samples
accepted generated DNA profiles that were uploaded, validating the acceptance criteria, with roughly 40% of the profiles uploaded generating hits to
either the Crime Scene Index or Convicted Offender Index.
This casework initiative highlights the value of defining acceptance
criteria based on the anticipated likelihood of success, whilst incorporating
a rapid and efficient testing protocol.
DNA, Casework, Review
68
B75
Automated Sample Processing and
Tracking System for DNA Profiling
of Single Source Samples
Maja Popovic, PhD*, Elaine Schneida, BS, Siddhartha K. Sinha, BS,
Anurag Bhushan, MBA, Jaiprakash G. Shewale, PhD, and Sudhir K.
Sinha, PhD, ReliaGene Technologies, Inc., 5525 Mounes Street,
Suite 101, New Orleans, LA 70123
community the usefulness of a tracking system and automated robotic
platforms for DNA analysis of single source samples in large volume.
humanity by describing the usefulness of a tracking system and automated
robotic platforms for DNA analysis of single source samples in large
volume.
The number of samples for DNA profiling has increased exponentially due to the acceptance of short tandem repeats (STRs) in forensic
casework analysis and in the court system. High volume sample
processing is increasing in importance in forensic laboratory, particularly
for single-source samples in data base studies.
The authors have designed an integrated LIMS system for tracking
samples with respect to processing status, completion of the results, data
acceptability, and generation of reports for ease of review. The samples are
processed using Wallac DBS puncher and the extraction is performed using
Qiagen BioRobot 8000DNA extraction system. Qiagen BioRobot 8000
Liquid Handling System is used for set up of fluorometric DNA quantitation, normalization of extracted DNA and PCR set up. PCR amplification
is carried using 9700 GeneAmp® PCR System, fragment analysis is performed on 3100 Genetic Analyzer, and genotyping is performed with
Genotyper®. All instrument platforms are compatible and interact with the
LIMS software. The information required and generated at each processing
station is integrated in the LIMS database. Use of robotic platforms
involves minimal manual intervention and facilitates high-throughput
sample processing in 96-well format.
The designed system for automated sample processing and tracking
minimizes the potential for error and maximizes the efficiency of DNA profiling of single source samples in high volume.
Automation, DNA, Robotic
B76
Strategies in Large Volume DNA
Analysis of No-Suspect Casework
Amrita Lal-Paterson, MSFS*, Gina Pineda, MS, Mary Burns, MS, Chris
Larsen, MS, Megan Shaffer, PhD, Huma Nasir, BS, Mark Tidwell, BS,
Brandi Washington, MS, Zoe Knesl, MS, Sarah Corrigan, MS, Tara
Johnson, MS, Penny Reid, MS, Lesley LeBlanc, BS, Kelly Zakel, BS,
Heather Overton, BS, Tabitha Benedict, MS, and Sudhir K. Sinha, PhD,
ReliaGene Technologies, Inc., 5525 Mounes Street, Suite 101, New
Orleans, LA 70123
community the approaches used in large volume DNA analysis of
no-suspect casework.
humanity by describing how to process large volume DNA analysis of
no-suspect casework.
Analysis for short tandem repeats (STRs) in forensic casework
analysis has become popular in the last decade. Further, the results from
STRs have been well accepted by the court system. Because of the high
power of discrimination of STRs, many States have begun examining
earlier forensic case samples, including no-suspect cases for DNA analysis.
The desire to process these samples for DNA evidence has overwhelmed
* Presenting Author
the capabilities of most laboratories. As a result, the number of backlog
cases have increased in the past few years and generated a need for
designing a sample processing system for high throughput. Many
government forensic laboratories are now outsourcing their no-suspect rape
cases to private laboratories including ReliaGene Technologies, Inc.
The authors have analyzed about 1500 unscreened rape kits. The
samples in these kits were screened for the presence of seminal fluid and
sperm cells. Approximately 57% of the rape kits had at least one sample
that was positive for either seminal fluid and/or sperm cells and 43% were
negative for both seminal fluid and sperm. The cases exhibiting samples
positive for seminal fluid and/or sperm cells were processed for autosomal
STR analysis. In order to process such a high volume of samples, Qiagen’s
EZ1 and M48 robots were integrated into the system for rapid analysis. Of
the 1500 cases investigated, 50% of the cases provided complete profiles.
This presentation will discuss different approaches used in the processing
of samples from screening to DNA testing.
Casework, DNA, No-Suspect
B77
Automation of Buccal Swab Processing
Cyrus K. Aidun, PhD, Georgia Institute of Technology, 500 10th Street,
NW, Atlanta, GA 30332-0620; Tammy P. Northrup, JD, Darrel Oubre,
Jr., BS, and Alyson Saadi, BS Louisiana State Police Crime Laboratory,
DNA Unit, 376 East Airport Drive, Baton Rouge, LA 70806; Amanda C.
Sozer, PhD*, DNA Technology Consulting Services, LLC, 10418
Hampton Road, Fairfax Station, VA 22039; and Pat W. Wojtkiewicz, PhD,
North Louisiana Criminalistics Laboratory, 1115 Brooks Street,
Shreveport, LA 71101
Attendees will learn about an automated method for introducing
buccal swabs into the DNA profiling laboratory which assures sample
integrity and reduces the man hours currently required to process buccal
swab samples.
humanity by demonstrating how the current methods for introducing
buccal swabs into the dna profiling laboratory are labor intensive due the
need for a witness and if not performed correctly, can lead to sample mixups. The presentation will provide the forensic community with a method
to rapidly and accurately introduce buccal swabs into the DNA profiling
laboratory in order to efficiently and effectively address the ever-increasing
number of samples which must be processed.
The testing of buccal cells on cotton-tipped, Dacron®, or sponge
applicators in large scale DNA profiling is desirable. The collection of the
sample is non-invasive, relatively easy to perform, and collection materials
are inexpensive. If collected properly, the cells on the swab yield a sufficient quantity of DNA for STR profiling. Presently, large scale sample
introduction or aliquoting practices require manual cutting of the swab and
placement into the correct well location in a 96 well tray or into individual
tubes. Although this direct transfer of cells from the swab is more reliable
and less expensive than performing an initial transfer to paper, the process
is labor intensive due to witness requirements, and can lead to sample mixups, if not performed properly. With the prospect of collecting over 100,000
buccal swab samples per year in the State of Louisiana, an automated
method for introducing buccal swab samples directly into the laboratory
testing process was developed. This system reads and records the sample
identification number, cuts the buccal swab using a non-contact laser-based
method to prevent contamination and automatically places the swab into a
designated location in a 96 well tray. The automated self-tracking system
assures sample integrity and reduces the man hours currently required to
process buccal swab samples.
To demonstrate the effectiveness of this technique, cotton tipped and
Dacron® buccal swabs were collected using standard methods. Two swabs
were collected from each individual. One swab was cut using the noncontact cutting device, while the other was cut manually by a razor blade.
* Presenting Author
The DNA yields between the samples were comparable, and the samples
cut with the laser showed no PCR inhibition or artifacts in the resulting
DNA profiles as compared to their controls. A description of the noncontact laser cutting unit and system management software will be
presented along with results from proof-of-concept studies and field
experience.
Buccal Swab, Automation, DNA Profiling
B78
Microchip-Integrated Purification and PCR
Amplification of DNA for Forensic Analysis
Joan M. Bienvenue, MS*, Lindsay A. Legendre, BS, Christopher M.
Easley, BS, Michael Roper, PhD, Jerome P. Ferrance, PhD, and James P.
Landers, PhD, University of Virginia, Department of Chemistry,
Mccormick Road, Charlottesville, VA 22904
The goal of this research project is to integrate the extraction and PCR
amplification of DNA into a single microdevice capable capable of downstream STR analysis.
humanity by demonstrating discussing the use of next-generation
microchip technology for forensic analysis of DNA. As the forensic
community looks for more rapid and cost-effective alternatives to current
methods, microdevices become an increasingly more viable option for
improving analysis. This presentation will highlight the use of an
integrated microdevice for solid-phase extraction and PCR amplification of
DNA and its impact forensic genetic analysis.
As genetic analysis for forensic casework continues to evolve, never
before has the need for fast, accurate, analysis of samples been more
pressing. Current techniques for DNA analysis require labor-intensive and
time-consuming processes. These methods, though effective, have led to a
dramatic backlog of casework, overwhelming crime laboratories at this
time. In addition, databasing efforts are hindered by this backlog of cases.
And in the current condition, many cases simply go unanalyzed. As such,
research efforts in forensics have focused on improving the methods
associated with the analysis of DNA to develop a more rapid and efficient
assay for casework profiling. As the field looks for more rapid and
cost-effective alternatives to current methods, microdevices become an
increasingly more viable option for improving analysis.
The application of microdevices to bioanalytical analyses has the
potential to drastically reduce the time required to perform a wide variety
of clinical assays. As such, microdevices are currently being designed,
developed and tested to improve the efficiency of processes associated with
forensic casework analysis. A fully-integrated, microchip capable of
performing the steps normally carried out at the bench would not only
reduce the time required to perform these tasks, but would also eliminate
user intervention and potential sources of contamination, preserving more
of the sample for future analysis. PCR and high-resolution DNA separations can currently be carried out on-chip, as well as solid-phase extraction
(SPE) of DNA from a variety of clinical, biohazardous, and forensically
significant samples. Integration of these processes is the first step towards
the creation of a device with genetic profiling capabilities.
The research presented here describes the chip-based approaches for
executing DNA extraction (via SPE) and STR allele-specific amplification
(via PCR), and how these two processes might be integrated in a single
microdevice. The device and its functionality are described, along with
results for extraction and amplification of human genomic DNA from
sperm cells. Glass microchip devices were designed with domains specific
for SPE and PCR. These were patterned using standard photolithographic
techniques and the SPE domain vacuum-loaded with silica beads ‘glued’
into place with a tetraethoxysilane (TEOS) sol-gel have been shown to
yield fast, efficient, solid phase extraction of DNA from a variety of
biological materials. Microchip PCR amplification of forensic STR loci in
sub-microliter volumes containing isolated sperm DNA is accomplished
69
using non-contact thermocycling (infrared heating and interferometric
temperature sensing). Fluidic control of the movement of purified DNA,
the solutions necessary for extraction, and PCR master mix into the appropriate domains on the microchip is mediated by an elastomeric valving
membrane. The work reported here investigates extraction and purification
and subsequent PCR amplification of DNA from semen and/or washed
sperm cells on an integrated, valved microchip. This represents one of the
major steps required development of a fully integrated microdevice capable
of total systematic DNA analysis for forensic casework.
DNA, Ccapillary Electrophoresis, Microchip
B79
Joint Validation of a High Throughput
Multi-Capillary Electrophoretic System
Using Fluorescent Multiplex Short
Tandem Repeats
Bridget M. Tincher, MSFS*, Marshall University, Forensic Science
Center, 1401 Forensic Science Drive, Huntington, WV 25701-3628; G.
Sue Rogers, MSFS, and Angelo Della Manna, MSFS, Alabama
Department of Forensic Science, 501 12th Street South, Birmingham, AL
35233; Terry Fenger, PhD, Marshall University, Forensic Science Center,
1401 Forensic Science Drive, Huntington, WV 25701-3628; and Rhonda
K. Roby, MPH, Identity Quest, LLC, 13203 Astoria Hill Court, Suite J,
Germantown, MD 20874
Attendees will learn procedures for high throughput processing of
samples for STR analysis. The presentation will demonstrate the positive
impact of collaboration with the NIJ supported Forensic Resource Network
(FRN) when validating a new system.
humanity by validating and implementing high throughput systems in order
to reduce the offender backlogs at state laboratories.
Over the past eight years, state and federal laboratories have processed
greater than one million convicted offender samples and subsequently
uploaded the resultant data into the national level of the COmbined DNA
Index System (CODIS). As of June 2004, greater than one million
convicted offender samples have been uploaded into NDIS and have
produced over 15,100 matches which have assisted in more than 18,100
investigations nationwide [http://www.fbi.gov/hq/lab/codis/success.htm:
online]. In order for a state to upload DNA profiles developed from
convicted offenders to NDIS, each sample must be comprised of the
standard 13 core STR loci. Prior to this NDIS requirement, the Alabama
Department of Forensic Sciences generated a state level convicted offender
database containing eight (8) of the core 13 STR loci.
The Forensic Resource Network (FRN) is a National Institute of
Justice (NIJ) supported group of four institutions, of which Marshall
University is one, that provide services, research and training to the
Forensic Community. As a component of the services provided by the
FRN, Marshall University Forensic Science Center (MUFSC) initiated a
collaboration with the Alabama Department of Forensic Sciences (ADFS)
to validate a high throughput system for short tandem repeat (STR)
analysis.
During the last several years, high throughput systems have evolved
which increased the capacity for both processing and analyzing convicted
offender samples. Previously, laboratories employed a conventional slab
gel electrophoresis approach or a single capillary electrophoresis testing
system. While the introduction of single capillary electrophoresis
platforms required less analyst laboratory time for electrophoresis setup,
the introduction of multicapillary testing platforms provided even greater
throughput. Furthermore, laboratories are now using multiplexed single
amplification chemistry which is able to co-amplify all of the required core
CODIS loci in a single amplification, rather than the previous two (2)
amplification approach which was required to obtain results of all 13 loci.
70
Once again, this advancement in forensic molecular biology techniques
provides for even greater throughput.
Polymerase chain reaction (PCR) multiplex amplification using
commercially available kits, subsequent separation of the DNA fragments
by either slab gel or capillary electrophoresis, and data analysis using
specific software provides an efficient, accurate method for the compilation
of DNA databases worldwide. Many laboratories have validated
commercial STR kits for forensic casework, databasing applications, and
parentage testing using ABI PRISM® Genetic Analyzers and/or the
FMBIO® II Fluorescent Imaging Device. In order to upload data into
CODIS, internal validation demonstrating reproducibility, precision, and
accuracy shall be performed and documented according to the FBI
Director’s, “Quality Assurance Standards for Convicted Offender DNA
Databasing Laboratories” [Forensic Science Communications 2000: 2 (3):
online].
Known human DNA was extracted from blood and buccal swabs.
Select samples were quantitated using yield gel and/or QuantiBlot®
Human DNA Quantification Kit. Extracted human cell line DNA (9947A)
was included as an amplification control. Amplifications were performed
in 25 L reaction volumes in MicroAmp® reaction tubes in the
GeneAmp® PCR System 9700 thermal cycler (Applied Biosystems, Foster
City, CA) using the Identifiler™ PCR Amplification Kit, a 5-dye multiplex
kit with the necessary reagents to amplify 15 tetranucleotide short tandem
repeat loci and the gender identification locus Amelogenin. The collaboration between the two agencies expedited the design, validation and implementation of the high throughput system adopted by the ADFS to increase
the number of convicted offender samples analyzed in house that qualify
for import into the national database. In this paper, the results of the
internal validation studies performed as a result of the collaboration
between the Alabama Department of Forensic Sciences and Marshall
University Forensic Science Center will be presented.
Supported under Award Number 2001-RC-CX-K002 from the Office
of Justice Programs, National Institute of Justice, Department of Justice.
Points of view in this document are those of the authors and do not necessarily represent the official position of the U.S. Department of Justice.
CODIS, High Throughput, Validation
B80
Streamlining the Analysis of Forensic
DNA Testing: New Tools to Allow
More Efficient Workflow From
Processing to Final Result
Cherisse Boland*, Applied Biosystems, 850 Lincoln Centre Drive,
Attendees will gain an understanding of the tools available for DNA
testing and utilizing these tools to make decisions during the processing of
biological evidence.
humanity by presenting an integrated system for DNA analysis.
This presentation will discuss new tools available for DNA testing that
allow clear decisions to be made in the initial and final stages of processing
DNA samples. These decisions include:
•
Incorporating a screening mechanism to assess the need for
further processing of DNA samples,
•
Detecting the presence of mixtures of male and female DNA, in
order to decide a path for extraction processing and subsequent
amplification,
•
Evaluating inhibition,
•
Deciding a path for extraction processing of compromised DNA
samples, and
•
Determining if DNA results obtained from a sample meet the
interpretation criteria set by the user.
* Presenting Author
Forensic scientists are often faced with making decisions about the
best approach to take when analyzing DNA samples to obtain optimal
results. However, often these decisions are made without prior knowledge
of the nature of the sample.
The Quantifiler™ Human DNA Quantification Kit and the
Quantifiler™ Y Human Male DNA Quantification Kit can be used to assess
the need for further processing of DNA samples by incorporating these
assays into the workflow as a screening mechanism. The utility of the
Quantifiler Human and Quantifiler Y assays in detecting mixtures of
human genomic DNA from male and female sources has been demonstrated. Experiments have been designed to simulate circumstances, such
as a rape case investigation, in which a small minor component of male
DNA must be discerned from a high background of female DNA have
resulted in successful detection of the male donor. To this end, the ability
to determine if a sample contains a mixture of female and male DNA and
the ability to use these assays as a quantitative interpretational aid for DNA
mixtures by determining the ratio of each contributor is a new and valuable
tool available to analysts.
Additionally, since the Quantifiler kits allow preliminary determination of male:female mixture ratios this information will assist in
selecting the appropriate method of extraction and genotyping of these
samples. Further, the use of the Quantifiler kits in conjunction with the
AmpFlSTR® Yfiler™ PCR Amplification Kit, produces reliable and
accurate Y-haplotypes and provides the forensic scientist with a robust set
of tools for Y-chromosome analysis. Part of this set of tools is a valuable
haplotype population database based on analysis of the 17-locus haplotype.
The Y-STR database allows the forensic scientist to estimate the frequency
of a Y-STR haplotype generated with the AmpFlSTR® Yfiler™ PCR
Amplification Kit.
Both the Quantifiler™ Human DNA Quantification Kit and the
Quantifiler™ Y Human Male DNA Quantification Kits are useful assays
not only for determining the amount of amplifiable DNA, but also for
evaluating the degree of inhibition in the sample. Inhibitors can interfere
with the reaction at several levels, leading to different degrees of PCR
efficiency and even to complete inhibition. A wide variety of PCR
inhibitors have been reported, particularly in DNA samples extracted from
bloodstains. Data will be shown which demonstrate the utility of the
Quantifiler™ Human DNA Quantification Kit and the Quantifiler™ Y
Human Male DNA Quantification Kit.
Finally, until recently, genotyping projects required manual
examination of all allele calls. GeneMapper® ID software minimizes this
bottleneck by automating allele calling using a novel process component
based quality values (PQVs) system that quickly assesses genotype quality
and provides automated concordance checks. Further, for those labs that
upload data to CODIS, projects can be exported into a CODIS compatible
reporting format allowing easy data uploading.
DNA, Quantification, Y-STR
B81
Operation Iraqi Freedom: AFDIL’s
Response and Challenges Faced
James M. DiFrancesco, MFS*, Patricia Foley, PhD, Allison Heller, BS,
Robin McDowell, MFS, Demris Lee, MSFS, David A. Boyer, MFS, James
J. Canik, Brion C. Smith, DDS, DoD DNA Registry, 1413 Research
Boulevard, Rockville, MD; and Lisa Pearse, MD, and Craig T.
Mallak, MD, Armed Forces Medical Examiner’s System, 1413 Research
Boulevard, Rockville, MD 20850
The goal of this presentation is to detail the challenges faced processing rush samples, identifying civilians, and maintaining a continuous
mass fatality posture during the conflict in Iraq.
humanity by giving the forensic community an awareness of what goes into
* Presenting Author
identifying those who are lost in combat and how a lab has to adapt to challenges during a time of increased and unpredictable caseload.
The opinions and assertions expressed herein are solely those of the
authors and should not be construed as official or as the views of the United
States Department of Defense or the United States Department of the Army.
The war against Iraq began on March 20, 2003 and the combat phase
officially ended on May 1, 2003, with the U.S. military gaining control
over the capital city of Baghdad. Currently, hostilities continue to produce
a large number of casualties. This presentation will detail the challenges
faced processing rush samples, identifying civilians, and maintaining a
continuous, high intensity mass fatality posture at the Armed Forces DNA
Identification Laboratory during the identification process of Operation
Iraqi Freedom (OIF).
The Armed Forces DNA Identification Laboratory (AFDIL) supports
the Armed Forces Medical Examiner System by providing DNA analysis
on human remains. DNA testing may be performed as the primary source
of identification; as a means to supplement other identification methods;
and also for re-association of fragmented remains. Currently, one scientific
method is required, although 2 or more is preferred, to identify a deceased
service member. Any combination of dental records, fingerprint records
and/or a DNA comparison to a known reference may be used. Reference
bloodstain card samples are maintained by the Armed Forces Repository of
Specimen Samples for the Identification of Remains (AFRSSIR).
AFRSSIR was established in 1991 for the sole purpose of providing a
direct reference sample for DNA comparisons to autopsy specimens in
order that no military service member casualty should ever go unidentified.
All military personnel and select civilian employees working for the military are required to have a DNA specimen on file at the AFRSSIR.
The 43-day war in Iraq resulted in 142 deaths of Army, Air Force,
Marine, Navy, and U.S. civilian personnel. Despite the declared end of
combat operations in Iraq, casualties from the U.S. occupation in Iraq continue to be processed through the combined efforts of AFDIL, AFRSSIR and
the Armed Forces Medical Examiner’s System. Currently, over 805 identifications have been made using a combination of dental, fingerprint and
DNA technology. AFDIL has seen an increase in caseload, turn around
time, and challenging specimens since the conflict has continued. Currently,
DNA analysis is performed on all military deaths regardless of a previous
identification by another scientific method. Cases in which there are no
other means of identification become top priority and are completed within
72 hours from the receipt of the specimen at AFDIL. To date DNA analysis
has been performed on more than 1200 samples with a 99% success rate.
Deaths during Operation Iraqi Freedom (OIF) resulted from combat,
homicides, accidents, suicides, and natural causes. Causes of combat
deaths during OIF ranged from single gunshot wounds to massive explosions. This resulted in remains that not only varied from fully intact bodies
to severely fragmented pieces, but also in the degree of decomposition. At
autopsy, every suitable piece of recovered human remains was sampled for
DNA testing for either identification, confirmation of identification or in
the case of highly fragmented remains, re-association. The reference
specimen is retrieved as required from cold storage at AFRSSIR and transported to AFDIL for analysis. A comparison is made between the DNA
profiles obtained from the autopsy specimens to the DNA profile obtained
from the bloodstain reference. Not all of the victims are military personnel
and therefore, do not have a bloodstain reference card on file at AFRSSIR.
This requires family references and personal effect to be collected and
tested in order to make the identification. The personal effects that are collected are varied and have ranged from toothbrushes to laptops. Many are
not suitable for testing.
It is with great pride that the combined efforts of AFRSSIR, AFDIL
and AFMES ensure that no service member paying the ultimate sacrifice
for their country would remain unknown; but rather expeditious identification, identification confirmation and re-association will be performed to
assist in laying that individual to rest. It is hoped that these efforts will
provide a sense of closure to the family.
Challenging Samples, Operation Iraqi Freedom, DNA
71
B82
Comparison of Buccal
Cell Collection Methods
Amanda M. Kleist, BS, Tammy P. Northrup, BS, JD, Darrel J. Oubre,
Jr., BS, Natasha H. Poe, BS*, and Alyson Saadi, BS, Louisiana State
Police Crime Laboratory, 376 East Airport Drive, Baton Rouge, LA
70806; Amanda C. Sozer, PhD, DNA Technology Consulting Services,
LLC, 10418 Hampton Road, Fairfax Station, VA 22039; Mark Tourre,
MSFS, Janaki Vaidyanathan, MS, MT, and Joanie B. Wilson, MT,
Louisiana State Police Crime Laboratory, 376 East Airport Drive, Baton
Rouge, LA 70806; and Patrick W. Wojtkiewicz, PhD, North Louisiana
Criminalistics Labortory, 1115 Brooks Street, Shreveport, LA 71101
Attendees will learn the most effective and reliable buccal cell
collection method(s) for DNA databasing samples.
humanity by presenting the most effective and reliable buccal cell
collection method(s) for DNA databasing samples for a high throughput
laboratory resulting from large volumes of DNA sample collections.
This presentation will present the research performed at the Louisiana
State Police Crime Laboratory to determine the most effective and reliable
buccal cell collector samples for databasing samples. Louisiana currently
has the most widespread and far reaching DNA databasing law in the
country. This law expressly authorizes the collection of arrestees’ DNA for
databasing purposes. The State of Louisiana has opted to utilize buccal cell
collections for all arrestee testing. In order to effectuate this comprehensive
databasing collection law, members of the Louisiana State Police Crime
Laboratory DNA Unit along with the Unit’s contract Technical Leader and
CODIS Consultant initiated research to determine the most reliable and
cost efficient buccal cell collection method. The results of this research will
be applied to Louisiana’s existing arrestee databasing program as well as
any expansions thereto.
Buccal swabs rather than blood samples are becoming the preferred
method of DNA sample collection for high volume DNA profiling laboratories because of the minimized health risks, the relative ease of collection
and shipping, as well as low costs associated with this method of collection.
Currently, collecting an adequate buccal cell sample in a simple, fast,
consistent and cost-efficient manner, while retaining the ability to store the
sample, is one of the biggest challenges facing DNA profiling programs.
With the anticipation of collecting over 100,000 buccal samples per year in
Louisiana, a study was undertaken to compare the consistency and effectiveness of available buccal cell sampling methods and devices. The
purpose of this study was to evaluate the DNA yield, the ability to obtain a
successful profile, and the efficiency of sample storage using various
buccal cell collection methods in order to select the most effective
collection method for the State of Louisiana.
Nine different collection methods were used to collect buccal cells
from sixteen subjects over a five-week collection period using a collection
scheme designed to minimize variability of other factors which might
influence buccal cell yield. Collection methods included the Omni Swab
collector, Bode Buccal DNA collector, and the Fitzco SampactTM Swab
collection device. Additionally, Pur-Wraps® sterile Dacron® polyestertipped applicator, sterile foam-tipped applicator, and sterile foam-tipped
applicator transferred to Whatman® Indicating FTA® Micro Card were
collected. Three collections were also performed using the Pur-Wraps®
sterile cotton-tipped applicator. These methods included one individual
collection, one that was transferred to Whatman® FTA® Micro Card, and
one that was transferred to Whatman® Indicating FTA® Micro Card.
The samples were extracted according to a standard protocol which
utilized the QIAamp® DNA Mini Kit (Qiagen Inc.). The amount of DNA
recovered was determined by both QuantiBlot® and QuantifilerTM
Human DNA Quantitation Kits (Applied Biosystems). The samples were
amplified with the AmpFlSTR® Profiler PlusTM and AmpFlSTR®
CofilerTM PCR Amplification Kits. Profiles were generated on the ABI
Prism® 3100 Genetic Analyzer and evaluated using Genescan® analysis
72
software (version 3.7.1) and Genotyper® (version 3.7) according to
laboratory protocols.
A comparison of DNA yields, reliability and reproducibility of DNA
profiles, quality of profiles, and ease of storage among the different
collection methods will be presented.
Buccal, Collection, Databasing
B83
The Scientific Working Group for the
Analysis of Seized Drugs (SWGDRUG)
Thomas J. Janovsky, BA*, Drug Enforcement Administration, Office of
Joseph P. Bono, MA*, Drug Enforcement Administration, Office of
Forensic Sciences, 2401 Jefferson Davis Highway, Alexandria, VA 22301
The objective of this presentation is to update forensic drug analysts
on the Scientific Working Group for the Analysis of Seized Drugs
(SWGDRUG) and on the proposals recently adopted as SWGDRUG
recommendations. These recommendations include:
•
A Code of Professional Conduct for forensic drug analysts
•
Validation of Analytical Methods (with an appendix)
•
Minimum Recommended Standards for Sampling Seized
Drugs for Qualitative Analysis
humanity by discussing the published recommendations which have been
available since 2000 to forensic scientists around the world. These recommendations have addressed Methods of Analysis, Education and Training,
and Quality Assurance issues and were developed with input from the international forensic drug analysts community.
The last two sets of recommendations (Validation of Analytical
Methods (with an appendix) and Sampling Seized Drugs for Qualitative
Analysis) have been discussed widely in the forensic science community.
During this presentation, the more significant factors from of these two sets
of recommendations will be explained. Time will be allocated for questions from attendees. Representatives from the SWGDRUG Core
Committee will answer questions and address the concerns of attendees.
In past presentations to the American Academy of Forensic Sciences,
a synopsis of SWGDRUG and the goals of the core committee have been
presented. This year’s program will focus on the specifics described above.
However, information is presented here for those unfamiliar with the
SWGDRUG process. SWGDRUG has been in existence since 1997. The
mission of SWGDRUG is to recommend minimum standards for the
forensic examination of seized drugs and to seek their international
acceptance.
The objectives of SWGDRUG are the following:
•
To recommend minimum standards for forensic drug analysts’
knowledge skills and abilities
•
To promote professional development of forensic drug analysts
•
To provide a means of information exchange within the forensic
drug analyst community
•
To promote the highest ethical standards of practitioners in all
areas of forensic drug analysis
•
To recommend minimum standards for drug examinations and
reporting
•
To establish quality assurance recommendations
•
To seek the international acceptance of SWGDRUG minimum
standards
The SWGDRUG core committee is comprised of representatives
from federal, state and local law enforcement agencies in the United States,
Canada, Great Britain, Germany, Japan, Australia, the European Network
of Forensic Science Institutes (ENFSI), the United Nations Drug Control
Program (UNDCP), Africa, and South America, a forensic science educator, the American Society of Crime Laboratory Directors (ASCLD),
ASTM, and the National Institute of Standards and Technology (NIST).
* Presenting Author
All members of the core committee have worked together over the past six
years to build a consensus on the development of recommendations that
have impacted forensic drug analysis standards internationally.
Published recommendations have been available since 2000 to
forensic scientists around the world. These recommendations have
addressed Methods of Analysis, Education and Training, and Quality
Assurance issues. All recommendations were developed with input from
the international forensic drug analysts community.
Criminalistics, SWGDRUG, Drug Analysis
B84
Purity Determination of Reference
Drug Standards and Quantitation
of Illicit Drug Samples by NMR
Patrick A. Hays, BS*, U.S. Drug Enforcement Administration, 22624
Dulles Summit Court, Dulles, VA 20166
After attending this presentation, attendees will come away from the
presentation with an understanding of how NMR is advantageous in the
quantitation of seized drugs and determining the purity of reference
standards.
humanity by making the attendee aware of the power of NMR as a
quantitative instrument.
Proton (1H) Nuclear Magnetic Resonance (NMR) Spectroscopy is a
rapid, sensitive, accurate, precise, reproducible, and versatile method for
determining the purity of reference standards and analyzing illicit drugs and
adulterants. No reference standard of the target compound(s) is required,
and aqueous and organic deuterated solvents enable great flexibility in
dissolving the drug(s) of interest.
For quantitative analysis, a weighed sample is dissolved in a
deuterated solvent(s) with a high purity internal standard. The 7 minute
NMR experiment employs 8 scans using a 45 second delay and 90o pulse.
In the determination of reference standard purity, the number of quantitative values available is equal to the number of integrals of the compound.
The relative standard deviation (RSD) of these signals is usually <1% for
pure standards and results agree well with other instruments determining
purity.
Unlike separation techniques such as gas chromatography (GC), high
performance liquid chromatography (HPLC), and capillary electrophoresis
(CE), NMR does not require a linearity study on every compound. NMR
response is proportional to the number of nuclei in a given frequency range,
not on a compound’s functional groups and is not subject to stationary
phase adsorption phenomena.
Excellent correlation coefficients
(>0.99995) were obtained using methamphetamine HCl dissolved in
deuterium oxide (D2O), with maleic acid as the internal standard. Average
recovery was 99.4% with RSD of 0.7%.
In the analysis of seized drug samples, high spectral resolution usually
results in at least one signal of the target analyte being free of interferences.
In complex mixtures, multiple quantitation results of the target compound
are possible in complex mixtures by subtracting the contribution of an
interfering compound from an integral where the target compound also
exists.
This method is also applicable to the determination of multiple target
components in a seized drug sample. For many exhibits good agreement
was determined by NMR and other techniques.
Nuclear Magnetic Resonance Spectroscopy, NMR, Quantitative
* Presenting Author
B85
Analysis of Seized Drug Evidence by
State and Local Crime Laboratories
in the United States
Liqun L. Wong, MA*, and Christine Sannerud, PhD, Drug Enforcement
Agency, Office of Diversion Control, 600 Army Navy Drive, E6353,
Arlington, VA 22202; and Kevin J. Strom, PhD, Michael R. Baylor, PhD,
Albert Bethke, PhD, and J. Valley Rachal, MS, RTI International, 3040
Cornwallis Road, PO Box 12194, Research Triangle Park, NC 27709
After attending this presentation, attendees will have an understanding
of the scope and prevalence of national and regional drug evidence seized
by law enforcement agencies for analysis by forensic laboratories
nationwide as well as the national and regional estimates of the top 25
drugs identified and reported by the nation’s forensic laboratories from
January 2004 through June 2004.
NFLIS state and local forensic laboratories analyze substances
secured in law enforcement operations across the country and offer a
valuable and unique resource for monitoring and understanding illegal drug
abuse and trafficking, including the diversion of legally manufactured
drugs into illegal markets. This presentation will impact the forensic
community and/or humanity by demonstrating how NFLIS is an important
analytical resource for drug policy and drug control agencies to support
drug scheduling efforts as well as providing timely information on drug
trafficking and abuse patterns across the United State.
of the scope and prevalence of national and regional drug evidence seized
by law enforcement agencies for analysis by forensic laboratories
nationwide as well as the national and regional estimates of the top 25
drugs identified and reported by the nation’s forensic laboratories from
January 2004 through June 2004.
This presentation will provide timely data on the variation in the
distribution of controlled substances and indicators of drug availability
across geographic areas based on laboratory analysis and identification
from the National Forensic Laboratory Information System (NFLIS). The
NFLIS program, which was established in September 1997, systematically
collects results from drug analyses conducted by federal, state and local
forensic laboratories. NFLIS is a database system that provides national
wide drug seizure information. To date, approximately 232 individual
forensic laboratories that perform drug analyses participate in NFLIS. The
program’s goal is to have all 306 forensic laboratories that perform drug
chemistry analyses in the United States participating within two years.
Highlighted findings will include the estimated prevalence of selected
“drugs of interest” and analyzed drug items by category. Quarterly Trends
for the national and regional estimated number of drug items analyzed by
state and local laboratories for 2001 through June 2004 will be presented.
Aggregate results of drugs identified and reported by participating NFLIS
laboratories representing the period January 2004 through June 2004 will
be presented. The distribution of drug items by percent and number of total
analyzed items in the state and local forensic laboratories will be depicted.
The number and percentage of analyzed drug items for the twenty-five
most frequently reported drugs, as well as the major drug categories such
as narcotic analgesics, benzodiazepines, “club drugs”, stimulants, and anabolic steroids will be discussed in tables and graphs. Special study data on
(1) comparison to “consumption based” data (NSDUH and DAWN);
(2) drug combinations, (3) drug purity, and (4) drugs identified in strategic
geographic locations as well as selected major metropolitan areas will be
summarized.
During the period January 2004 through June 2004, an estimated
850,000 drug items were analyzed by state and local laboratories in the
United States. Cannabis/THC was the most frequently identified drug,
followed by cocaine, methamphetamine, and heroin. This has been a consistent pattern for the past three years. About one percent of all reported
drug items contained two or more substances, most commonly
73
heroin/cocaine. Overall, nearly 55% of drug combinations contained heroin
or cocaine, or both, while approximately 20% contained methamphetamine.
NFLIS state and local forensic laboratories analyze substances
secured in law enforcement operations across the country and offer a
valuable and unique resource for monitoring and understanding illegal drug
abuse and trafficking, including the diversion of legally manufactured
drugs into illegal markets. NFLIS is an important analytical resource for
drug policy and drug control agencies to support drug scheduling efforts as
well as providing timely information on drug trafficking and abuse patterns
across the United States.
Drug Analysis, Drug Seizures, Drub Database
B86
Qualitative and Quantitative Values
on Drug Smuggling Files Which
Determined in Narcotic Laboratories,
Council Legal Medicine, Ministry of
Justice Turkey
Salih Cengiz, PhD*, Institute of Forensic Sciences, Istanbul University,
Adli Týp Enstitüsü Cerrahpasa, Istanbul, 34300, Turkey; and Tulin
Cinar, MSc, Ministry of Justice, Council of Legal Medicine and Forensic
Sciences, Adli Týp Kurumu, Istanbul, 34300, Turkey
After attending this presentation, attendees will understand the quality
and the quantity of illicit drugs seized on the routes that pass from Turkey;
will understand the purities of illicit drugs in countries closer to production
regions; will be briefed on the fight against drug smugling in Turkey.
humanity by providing valuable data about illicit drug trafficking and
fighting about, so that the impact will be from police and justice
departments.
In this study, which was carried out at the Narcotics Division of
Chemical Analysis Department, Council of the Forensic Medicine,
Ministry of Justice, results of qualitative and quantitative analysis were
illustrated in tables and graphs for 2,375 case reports belonging to a period
of 2001 to 2003. During these three years 9,212 packages were analyzed
for their contents of heroin, morphine, opium, hashish, cocaine, cannabis,
cannabis- tobacco mixes, acetic anhydride, ecstasy, captagon, Legal but
with red and green prescription tablets and drugs, lysergic acid diethylamide (LSD) impregnated chips, materials which were examined for their
drug contents, powder and liquid amphetamines, powder methylene-dioxymethamphetamine and other solid and liquid materials which were not
drugs but found in clandestine.
In this study color tests, TLC and microscopic investigation were used
for screening. HPLC, GC, and GC/MS were used for confirmation of the
qualitative and quantitative data. It was found that among the solid materials, the highest quantity belonged to heroin and the highest quantity of
tablets belonged to captagon. Ecstasy and captagon had significant
increases in quantities, if all the analyzed materials are considered. The
results of the quantitative analysis have shown that the purities of methylene-dioxy-methamphetamine and amphetamines still approximately at
the same mean value while the purity of cocaine samples have increased
about 10% in 2002 and 2003 in comparison with 2001. The purity of
heroin samples have decreased about 10% in 2002 and 2003 if compared
with 2001 values.
In conclusion; international studies and findings concerning the production, trafficking, and purity of illegal drugs take into account the illegal
production of heroin, it is believed that the traffic is shifting to neighboring
countries due to 10% decrease of its purity.
Illicit Drug, Composition, Trafficking
74
B87
The Application of Capillary Electrophoresis
for Enantiomeric Separation of
N,N-Dimethylamphetamine and its
Related Analogs: Intelligence Study on
Routine N,N-dimethylamphetamine Seizures
Wing Sze Lee, PhD*, Man Fai Chan, MPhil, and Wai Ming Tam, PhD,
Forensic Science Division, Government Laboratory, Homantin
Government Offices, HKSAR, 7/F Ho Man Tin Government Offices,
88 Chung Hau Street, KLN, Hong Kong, 852, China
This goal of this presentation is to demonstrate the use of capillary
electrophoresis (CE) for chiral separation of the seized N,N-dimethylamphetamine (DMA) samples with aim of obtaining important information
for intelligence study.
humanity by illustrating the significance of chiral separation of seized
drugs in forensic scince so that valuable information such as intrinsic
characteristics of the seized samples and clues for predicting possible synthetic methodologies can thus be obtained.
Methamphetamine (MA), a powerful stimulant of the central nervous
system, is one of the most popular abused drugs in Hong Kong. DMA, the
N-methylated analogue of the MA, is well known of producing behavioral
effects that are generally comparable to those of MA but with reduced
potency. Cases related to DMA have increased in Hong Kong in the past
few years. It may be due to the fact that crystalline forms of DMA and MA
(‘ICE’) share similar physical appearance. Thus, DMA can be sold to
abusers as MA. Most of the seized DMA samples are crystalline solids that
are either in the pure form or mixed with MA. Apart from crystalline solid
samples, some samples are tablets. Like ‘ecstasy’, these tablets are of
different color, marking and usually mixed with a number of dangerous
drugs such as 3,4-methylenedioxymethamphetamine (MDMA), 4-methylenedioxymethamphetamine (MDA), MA, and ketamine.
The recent increase in the abuse of DMA in Hong Kong is of great
concern to law enforcement departments. However, only a few studies on
DMA have been reported in the literature compared to its analogue, MA.
Therefore, a detailed study on DMA is important for deriving valuable
information for drug intelligence purpose. Both MA and DMA have a
chiral carbon centre at the α-position, which is known to affect their
potency. For example, d-MA and d-DMA are known to have stronger
stimulatory effect than their corresponding counterparts, l-MA and l-DMA.
By measuring the enantiomeric excesses of the seized samples, intrinsic
characteristics of these samples can be obtained. In addition to this, the
enantiomeric purities of the seized drugs can provide clues for predicting
possible synthetic methodologies. Identification of racemic DMA or MA
indicates that these samples are derived from reductive amination of an
achiral precursor phenylpropan-2-one (P2P). On the other hand, optically
pure DMA or MA may have come from stereospecific reduction of the
enantiopure β-hydroxyphenethylamines (i.e., ephedrine, pseudoephedrine,
methylephedrine, and methylpseudoephedrine.)
A number of analytical methods have been employed for the separation of chiral compounds. Both GC and HPLC are commonly used
methods, however, they do have some limitations. Usually GC analysis
requires tedious derivatization with chiral reagents and HPLC analysis
involves the use of expensive chiral columns/mobile phase. In contrast,
capillary electrophoresis is relatively simple, of low cost and has very high
separation efficiency. In fact, previous study in the laboratory has successfully demonstrated the use of CE for enantiomeric separation of dl-MA and
its related compounds (i.e., dl-ephedrine and dl-pseudoephedrine). In this
study, an optimized CE method for simultaneous chiral separation of dlDMA, dl-MA dl-ephedrine, dl-pseudoephedrine and dl-methylephedrine is
reported. The method has been subsequently applied to analyze seized
DMA samples in Hong Kong. Results show that all the seized DMA
samples are predominantly the d-form (>87% ee). The MA samples are of
* Presenting Author
various enantiomeric forms, but none of them is racemic. These results
indicate that the seized samples are unlikely to be synthesized from P2P. It
seems to be more likely that MA and DMA were obtained by way of
reduction of ephedrine/pseudoephedrine and methylephedrine/methylpseudoephedrine respectively
N,N-Dimethylamphetamine, Capillary Electrophoresis, Intelligence
Study
B88
Game’s Up - The Presence of
Tranquilizers and Stimulants
in Venison Detected by HPLC-MS
Heather A. McCauley, BS*, and Rick A. Flurer, PhD, U.S. Food and
Drug Administration, Forensic Chemistry Center, 6751 Steger Drive,
Cincinnati, OH 45237
Attendees will learn of an unusual forensic case in which tranquilzers
and stimulants were detected in processed tissue. In the absence of blood
and urine, the detection of these drugs was quite challenging. The
sensitivity that HPLC-MS provides was advantageous and will be
discussed.
humanity by highlighting the advantage of HPLC-MS in the forensic laboratory setting. The sensitivity that LC-MS provides combined with the
added sensitivity of the instrument in MS/MS mode permits the detection
of drugs of interest in difficult matrices at low ppb range levels.
The preferred matrices for detection of drug residues in biological
fluids are blood and urine. While these matrices can prove to be quite
challenging, in their absence, with only processed tissue available for
sampling, the challenge can be amplified for the analytical chemist. This
paper will discuss an unusual forensic dilemma in which the sensitivity of
HPLC-MS proved to be advantageous.
The sale of a specific deer for hunting is illegal in most states. Once
a deer has been taken in violation of State law and transported in interstate
commerce, it becomes a violation of Federal law under the U.S. Fish and
Wildlife’s Lacey Act. In a recent case farm raised deer were being hunted
at a private preserve in violation of State laws. In most instances, the clients
traveled to the preserve from out of state, and the hides, meat, and antlers
were then shipped across state lines to the hunters in their home states. The
case became a joint effort between the state Department of Natural
Resources and U.S. Fish and Wildlife. The Food and Drug Administration’s
Forensic Chemistry Center became involved in the case when it was
learned that once the deer were selected by the client, they were unlawfully
tranquilized, moved to a small pen, and “reversed” (i.e., revived with stimulants) to then be killed by the client/hunter. The presence of tranquilizing
and/or stimulant drugs in meat is a violation of FDA law whereby meat
intended for consumption containing these compounds is considered to be
adulterated.
The drugs that were specifically targeted for analysis were xylazine,
tiletamine, zolazepam, and tolazoline. Xylazine is an α2-adrenergic
receptor agonist and acts as a sedative. Tiletamine is a dissociative agent
and is pharmacologically similar to ketamine. It produces immobilization
and acts as an analgesic. Zolazepam is a benzodiazepine sedative and
muscle relaxant. Zolazepam also prevents seizures associated with tiletamine and is therefore marketed as the combination drug Telazol®. The
drug mixture of xylazine and Telazol is commonly referred to as a
“cocktail” and is considered an effective way to sedate large animals. The
Telazol can be purchased as a powder and rather than reconstituting the
powder with 5 mL of sterile water, 5 mL of xylazine drug solution is used
and the mixture is injected intramuscularly. Tolazoline is a mixed α1 and
α2 adrenergic receptor agonist and is used to reverse the effects of xylazine
sedation.
A number of factors made the detection of these drugs challenging for
the analytical chemist. The drug dosages ranged from 250mg to 400mg
* Presenting Author
and the half-lives of the drugs spanned from approximately 50 minutes to
4.5 hours. However, the laboratory did not have any information regarding
the time frame in which the deer were drugged before being killed.
Average adult bucks range in weight from 100lbs to 250lbs, and most of the
drugs readily distribute to all body tissues though tolazoline tends to
concentrate in the liver and kidneys.
The initial samples received in the laboratory consisted of highly
processed meat. The samples were prepared using in part a method
published in the “Handbook of Analytical Toxicology” which generates
residues for weak acid/neutral drugs, strong acid drugs, and basic drugs.
Initial sample preparation was done by weighing approximately 10g of
meat and making a slurry with water. The slurry was acidified, saturated
with salt, and placed in a hot water bath for 30min. The solution was then
filtered and extracted with an equal volume of ethyl ether. The drugs of
interest are basic and therefore only the aqueous extract was taken through
further extraction procedures while the ethyl ether layer was discarded.
The aqueous extract was made basic and extracted with equal volumes of
chloroform. The resulting basic extract was first analyzed using GC-MS
and no drugs were detected. Control deer meat was obtained to conduct
spiking experiments. Based on these experiments, between 5 and 10ug/mL
was the detection limit for the drugs of interest operating this instrumentation in full scan mode. Due to the sensitivity limitations and the absence
of data regarding the stability of the drugs during the meat processing,
detection by GC-MS did not appear to be feasible. The original sample
extracts resulted in approximately 300 mL of chloroform. These extracts
were taken to dryness and then reconstituted with 200µL of 10%
MeOH/0.5% formic acid in water, thereby increasing the concentration by
approximately 1500 fold. The samples were then analyzed using HPLCMS. The samples were analyzed with a gradient mobile phase of 0.1%
formic acid and acetonitrile on a C18 column and were introduced into the
MS by electrospray ionization. The sensitivity that the LC-MS provided
combined with the added specificity of the instrument in MS/MS mode permitted detection of the drugs of interest in highly processed venison at low
ppb range levels.
Stimulants, Tranquilizers, HPLC-MS
B89
The Important Role of Classical Analytical
Techniques in Modern Problem Solving
Approaches in Non-Routine Cases
Peter R. De Forest, DCrim*, Department of Sciences, John Jay College
of Criminal Justice, The City University of New York, 445 West 59th
Street, New York, NY 10019
The goal of this presentation is to stimulate thinking concerning the
highly varied nature of physical evidence problems that arise with
regularity in criminalistics and to draw attention to the dangers of overreliance on modern technology at the expense of thoughtful scientific
approaches to these problems. Modern instruments are merely very useful
tools. They do not replace the experienced scientist’s brain.
Introduction: Technological developments over the last few decades
have made an impressive array of powerful analytical tools available to the
modern forensic science laboratory. The development and refinement of
chemical instrumentation over the past sixty years has revolutionized analytical chemistry and molecular biology. Physical methods have largely
replaced wet chemical ones. The changes are nothing short of astounding.
This has not necessarily translated into better criminalistics case solutions
across the board. It certainly has improved the ability to provide better
answers to relatively straightforward questions, such as “did the bloodstain
found in the suspect’s car come from the homicide victim” and many
similar associative evidence questions? Criminalistics is not limited to
these questions. Such simple routine questions are often posed by scientifically naïve investigators or attorneys before the evidence reaches the
laboratory. For many cases the laboratory-generated answers to these
75
questions suffice to provide an adequate case solution. In other case situations evidence amenable to such easily developed routine questions may
not exist or such questions may not be particularly relevant in the context
of the case. One of the most challenging aspects of criminalistics is that the
physical evidence problems that are presented by anything but the simplest
cases do not define themselves. Modern forensic science laboratories have
many sophisticated tools. However, before these powerful tools can be
applied to the case solution, the analytical problem must be defined. A scientific assessment of the totality of the potential evidence is required before
an approach to the analysis of the physical items in the case can be
designed. This is the role of the criminalist.
Routine and Non-Routine Analyses: Narrow predefined questions
can be answered readily with the routine application of modern
instrumental techniques. For such problems, where throughput is
important, they are unsurpassed. What is refered to as the microanalytical
or microchemical approach is much more flexible and general. It may
involve the use of many techniques including the most appropriate
instrumental methods . It is an approach, not a method or technique. The
experienced analyst’s brain is the most critical part of the process. The
quality of the analysis does not depend primarily on instrumental
parameters. It depends most critically on the experience and quality of the
scientist carrying them out. With this approach the first step is most often
simply looking at the sample macroscopically and microscopically. Much
is learned in this way. Much is lost otherwise. Consider the information
that can never be retrieved where something as simple as merely dissolving
a sample in preparation for testing by certain instrumental methods
comprises the first step. Such seemingly innocuous “cut and extract” or
“dilute and shoot” steps often result in the loss of information including
contextual information, the degree of homogeneity or heterogeneity, and
something about the number and nature of physical components. For some
routine analyses, where a simple question is posed, the loss of information
may be of little consequence. In criminalistics applications some of these
simple first steps in sample characterization may be critical. Follow-on
microchemical steps may provide even richer information.
A key adjective used to modify “analyses” in the above discussion is
“routine.” Indeed, for routine analyses the ascendancy of instrumental
methods has been an unalloyed advance. The useful role of microchemical
testing in high-throughput, a routine analysis is very limited. It is with challenging non-routine problems where microchemical methods and crystal
tests demonstrate their value. They are indispensable tools in a more
general microanalytical approach to sample characterization. Such a
general approach is needed in physical evidence investigations. Here every
case is different, and a “one-size-fits-all” or “cookie-cutter” approach is
inappropriate. These are the kinds of challenges that regularly arise in trace
evidence problems in criminalistics and for which the microchemical
approach is so ideally suited. Nothing else comes close. The microanalytical approach makes the best use of all available methods, including
instrumental ones. It is this approach that defines the problem in detail and
informs and guides the selection of the most appropriate tools to be
employed in its solution. Crystal tests are a key component of this powerful problem solving approach. Their ready availability is essential for its
successful application.
The Microanalytical or Microchemical Approach: There is an
unfortunate tendency among members of the public and even among some
scientists to associate and perhaps even equate high tech instrumentation
with science. This turns reality on its head. A minimally trained technician
can often generate valid and useful data for predefined problems using
modern instrumentation. This is not the case with crystal tests and microchemical approaches. In-depth knowledge of chemistry and the scientific
method is necessary to exploit the microchemical approach. It takes an
experienced scientist to define and redefine the problem as the analysis
76
proceeds and to select the best tools. There is no better way to deal with
complex trace evidence problems. However, this approach does require
experienced scientists. Unfortunately, “penny wise and pound foolish” laboratory administrators might see this as a drawback.
In Summary, at first glance it might seem that many instrumental
methods would offer a speed advantage over microchemical testing.
However, this is often only true for routine problems where many samples
are being analyzed and the instrument set-up time can be averaged over a
large number of samples, so that it is a small fraction of the “per sample”
analysis time. For the non-routine or “one-off” problems occurring in criminalistics, microchemical methods often enjoy a substantial speed
advantage. Typically, when the need is recognized during the course of a
complex analysis, the analyst can complete the test (or succession of tests)
without breaking stride by having to leave the microscopy bench. T he risk
of sample loss and contamination may be reduced.
References
De Forest, P.R., “Microchemical Crystal Tests,” letter to the editor, The
Microscope, Vol. 36, No. 3 and 4, 1988, pp. 373-377.
De Forest, P.R., “Recapturing the Essence of Criminalistics”, Founders
Lecture, California Association of Criminalists, Science and Justice, Vol.
39, July-September, 1999, pp. 196-208.
Criminalistics, Microchemistry, Crystal Tests
B90
History of Microcrystal Tests
for Drug Identification
Hiram K. Evans, MSc*, San Bernardino County Sheriff’s Department,
Scientific Investigations Division, 200 South Lena Road, San Bernardino,
CA 92415-0056
Attendees will learn the extent of literature references regarding the
use and validation of microcrystal tests for the identification of drugs and
controlled substances.
humanity by supplying a histoprical perspective of use of microcrystal tests
for drug identification, including a bibliography.
The early history of microcrystal tests is the history of chemistry and
microscopy. By the mid-1830’s toxicologists needed something besides
the drastic chemical treatments applied to heavy metal poisons for application to alkaloidal poisons. While any history moves forward in small
steps, microcrystal tests in forensic science have a series of watershed
dates. 1865 brought Helwig’s Das Mikroskop in Der Toxicologie and
Wormley’s Microchemistry of Poisons. By 1921 and the publication of
Behrens-Kley’s Organische Mikrochemische Analyse and Stephenson’s
Some Microchemical Tests for Alkaloids forensic science had expanded to
include the identification of controlled drugs. 1934 and 1935 saw the publication, respectively, of Amelink’s Schema zur Mikrochemischen
Identifikation von Alkaloiden and Rosenthaler’s Toxicologische
Mikroanalyse. From the 1920’s through the 1960’s, frequent collaborative
work was performed and published in JOAC, expanding application and
introducing acid reagent media. 1969 was probably the greatest year with
publication of E. G. C. Clarke’s Isolation and Identification of Drugs and
Charles C. Fulton’s Modern Microcrystal Tests for Drugs. Publications on
microcrystal tests have decreased in number, concentrating on determination of isomeric forms, but the tests remain part of some training
programs, are included in new ASTM Standard Guides, and are accepted
by ASCLD/LAB for use in accredited laboratories.
Microcrystal Tests, Drugs, Identification
* Presenting Author
B91
Practical Identity Using Microcrystal Tests
B92
Wayne Moorehead, MS*, Orange County Sheriff-Coroner, 320 North
Flower Street, Santa Ana, CA 92703
After attending this presentation, attendees will learn the role of microcrystal tests in analytical schemes and their usefulness in criminalistics.
humanity by reviewing of some aspects of the essence of criminalistics and
suggestions for increasing the visibility of this useful method of analysis.
Most forensic scientists with a modicum of interest in forensic science
when asked for the definition of their profession will be able to state that it
is the application of science toward civil and criminal law matters. Ask
them to describe the core principles of criminalistics and, for many, silence
results. Near the hub of the profession of criminalistics resides the practical
identity of evidence.
To the criminalist identity has two meanings – to make an identification and to make an individualization. The evidence determines which
of the two or if both concepts are to be pursued. Criminalistics is the
science of individualization – the pointing to or identity of one object or
person to the exclusion of all other objects or people. Often the criminalist
must identify the evidence before individualizing it to a unique person,
place, or thing. In criminalistics, making an identification of an unknown
substance is not unlike other sciences. When the criminalist has an
unknown powder suspected of being a drug, an identification of the drug is
made by matching the properties of the questioned drug to a known drug
having the same properties. Microcrystal tests have been a part of the
practical identity of routine controlled substance analyses for many decades
as well as for unknown substances in trace evidence analysis.
There are two types of science in practice. The first type is theoretical.
The development of new materials and technology requires determining
structure and properties, and exemplifies what the public perceives as
science. This science identifies never before identified chemicals through
structural elucidation by using an array of instrumentation and methods.
This type of identification, that of identifying a “true unknown” with a
variety of instrumental methods, never occurs in forensic science. The
second type of science involves the practical identification or comparative
analysis of materials. A comparison of the unknown against a database of
known standards is conducted. The standards may be in the form of spectra
or the results of chemical reactions called microcrystal tests. The comparison of a microcrystal test result from a questioned sample to a known
drug standard is equivalent to the common practice of comparing the
infrared or mass spectrum of a questioned sample to a known drug
standard. The inclusion of microcrystal tests as the confirmatory tests of an
analytical scheme for common controlled substances results in the practical
identity of the drug, providing a savings of time per case, and greater case
output with no reduction in the quality of the analyses. All scientists,
whether from outside the field of criminalistics or from within, must understand the role of microcrystal tests for common drugs of abuse: that of
being the last part of a scheme of analysis. For unknowns in trace evidence,
the microcrystal tests are used in conjunction with optical properties or
other microscopical or instrumental methods. In order to improve the visibility of microcrystal tests some suggestions are offered.
1) Give presentation on microcrystal tests at large venue scientific
meetings
2) Publish papers in widely read and respected scientific journals
3) Respond to misleading and misinformed articles on color spot
tests and microcrystal tests
4) Do not use an article as a reference that is misleading or misinformed
5) Emphasize the benefit of microcrystal tests for teaching
qualitative analysis in inorganic and organic chemistry –
e.g., limited amounts of material and safety to students
6) Encourage other scientists to use microscopy and microcrystal tests
7) Join scientific organizations to provide correct information on
the use, value, and limitations of microcrystal tests.
Drugs, Microcrystal Test, Identification
* Presenting Author
SWGDRUG, ASTM, and SDSO:
How the San Diego Sheriff’s Lab Uses
Microcrystalline Tests in Drug Analysis
Marty C. Fink, BA*, San Diego Sheriff’s Crime Laboratory, 5255 Mount
Etna Drive, San Diego, CA 92117-6912
Attendees will learn that there is still a place for 19th century
chemistry using microcrystal tests in a 21st century laboratory.
humanity by showing that the use of microcrystal tests still has a place in a
modern crime laboratory.
Microcrystalline tests are old; they’re anachronistic; they are good for
screening only; they offer no structural elucidation; they produce no
reviewable data. All of these arguments have been used to preclude the use
of microcrystalline tests in drug analysis. However, 19th century chemistry
still works and has a place in a 21st century lab.
The Scientific Working Group for the analysis of Seized Drugs
(SWGDRUG) formally adopted a set of recommendations on Education
and Training, Quality Assurance, and Methods of Analysis of seized drugs
in May, 2000. In the forward, SWGDRUG “strongly urges the adoption of
this recommendation by any laboratory involved in the analysis of seized
drugs.” The original recommendations excluded any use of microcrystalline tests as part of the Minimum Standards for Forensic Drug
Identification. Several letters and discussions later, microcrystalline tests
were included in Category C, the least discriminatory of the categories
along with color tests, melting point, and UV spectrophotometry. More
letters and discussion moved them to Category B where they currently
reside.
The SWGDRUG recommendations were initially submitted to ASTM
prior to the 2002 ASTM meeting in Atlanta for adoption as standard
methods. They were defeated and returned to committee for revision. At
the February 2004 meeting in Dallas, after a few modifications, ASTM
officially adopted the SWGDRUG recommendations as the standard for
drug analysis.
In the SWGDRUG identification scheme, if a Category A method is
not used, two uncorrelated methods from Category B must be used. The
San Diego Sheriff’s Lab uses a combination of color screening tests, microcrystalline tests, and thin layer chromatography for the majority of the
powder identifications. Each analyst receives training in basic microscopy
and a core training module in the use of microcrystalline techniques as part
of the training program. The examiner is ultimately given 25-30 qualifying
samples in which only color spot tests, TLC, microcrystalline tests, and
FTIR can be used. GCMS training is a separate module commencing only
after the drug chemist has mastered the above four techniques. A second
set of qualifying samples is then given in which GCMS may be used.
Microcrystal Tests, SWGDRUG, ASTM
B93
The Characterization of Reloading
Smokeless Powders Toward Brand
Identification
Wayne Moorehead, MS*, and Annie Tibbetts, BS, Orange County SheriffCoroner, 320 North Flower Street, Santa Ana, CA 92703
of the value of morphology, micrometry, and instrumental methods in the
brand identification of smokeless powders.
humanity with the use of the database of information by providing investigators and prosecuting attorneys with the brand or a short list of brands of
smokeless powder used by a bomber. Additionally, the database may be
available on CD at a later time for use by other laboratories.
77
On completion of the presentation, the listener will have an understanding of the value of morphology, micrometry, and instrumental
methods in the brand identification of smokeless powders.
By using morphology, micrometry, and other methods, unique brand
identification or a short list of possible smokeless powders from an
unknown powder is possible. A sample size of 148 smokeless powder
brands, with a few repeats, was examined for potential identifying features
such as morphology, color, texture, coating, dimensional measurement,
weight, and chemical content. The questioned powder sample must contain
a sufficient number of unburned powder kernels for comparison.
While the government closely monitors explosives, canisters of
smokeless powders can be purchased over-the-counter by sport shooters
and hunters for reloading ammunition or by bombers for improvised
explosive device construction. Reloading or canister smokeless powders
offer an available relatively inexpensive explosive for the criminal element.
Explosive fillers from pipe bombs submitted to crime laboratories
frequently contain smokeless powder.
Providing smokeless powder brand identification information to an
investigator can assist in the investigation or trial of a bombing suspect.
Smokeless powders were subjected to different methods of analysis to
build a library database for future comparisons for brand identification or
provide a selective list of possible powders.
Macroscopic and microscopic features were noted. Unless a unique
identifier, such as a colored ‘dot’, was present the macro-scale examination
could not produce a single, unique brand. Using a stereomicroscope with
a digital camera and semi-automated measurement software, at least 25
random kernels (and up to 100 random kernels) from each of the 148
samples were measured for their relevant dimensions. Use of micro-morphology and other microscopical features to categorize the powders
eliminated significant non-conforming brands for further comparison.
Micrometry measurements were statistically evaluated against like
morphology. The dimensional parameters were treated to Bonferoni-Dunn
statistical analysis. The standard T-test was rejected because it is used for
one-against-one comparisons while Bonferoni-Dunn provides one against
many, taking into account the effect of multiple comparisons. Often characterization of features such as micro-morphology, color, texture, and
coating, along with dimensional measurements permitted unique or limited
number of possible smokeless powder brands. The mass of sample of the
various powder brands using triplicate samples of 50 kernels at a time for
measurement further characterized the powders. Gas chromatography with
mass spectrometry was used to characterize the smokeless powders with
positive results. Of the 148 samples characterized, most brands could be
identified uniquely while some samples resulted in a short list of possible
brands. Chemical content was able to resolve several of these.
Smokeless Powder, Morphology, Micrometry
B94
The Development of a Comprehensive
Scheme for the Analysis of Electrical
Tape Using Instrumental and
Chemometric Methods
Amanda B. Sturdevant, BS*, School of Criminal Justice, Michigan State
University, East Lansing, MI 48824; and Leanora Brun-Conti, BS,
Edward C. Bender, BS, and John V. Goodpaster, PhD, Forensic Science
Laboratory, Bureau of Alcohol, Tobacco, Firearms and Explosives, 6000
Ammendale Road, Ammendale, MD 20705
of the capabilities and limitations of some of the techniques available for
the forensic analysis of electrical tape. Furthermore, this research will
provide the forensic science community with an effective analytical
scheme for examining and comparing questioned and known samples of
electrical tape.
78
Polyvinyl chloride (PVC) tape, more commonly known as electrical
tape, is often encountered during explosive investigations. Electrical tape
may be used in the construction of improvised explosive devices (IEDs) for
wire insulation, for sealing openings, and for securing fuses and other
components onto a device. If tape is recovered and submitted as evidence,
an analyst may be asked to compare the questioned tape with a known
source, often a roll of tape obtained from a suspect. On rare occasions a
physical match of the tape ends can positively identify the questioned tape
fragment as having originated from the known source. However, when
such individual characteristics are not present, the analyst must resort to
comparisons of class characteristics for association or elimination. Most
often these include physical dimensions, surface texture, and chemical
composition.
Before carrying out any research study of the class characteristics of
electrical tape, a number of challenges must be overcome. First, a detailed
understanding of the inherent heterogeneity of the sample population,
arising from both chemical composition and product distribution, is
needed. Only then can a representative sample of the population be
obtained. However, most formulations of electrical tape are proprietary
and the manufacturers will not disclose the identity of some of the raw
materials used. This limits what information is known about the
composition of the product. With regard to distribution, tape from the same
manufacturer may often be marketed under many different brand names.
Chemically and physically the tapes are considered to be the same, while
commercially they are different. Next, following sampling, the use of
multiple analytical methods is necessary in order to fairly evaluate the
relative merits of each individual method. Finally, using quantitative
methods of analyzing the results allows for more reliable conclusions.
There have been numerous articles published regarding the forensic
analysis of adhesives and a few that focus specifically on electrical tape;
however, none of these have directly addressed the above-mentioned
issues. In this study, discussions and plant tours with tape manufacturers
and careful attention to manufacturing/product codes has allowed for a
greater understanding of the tape industry. The sampling methodology
involved acquisition of known exemplars directly from a manufacturer as
well as the traditional route of purchasing tape from commercial sources,
but with a better understanding of the true manufacturer of a sample.
Specifically, nine rolls of tape, including three rolls from three different
batches of three different types of tape, were obtained directly from a
manufacturer, 3M. Also, 32 other samples from 18 other brands
representing a total of 10 manufacturers were obtained. All the samples
were analyzed by the following methods: Attenuated Total Reflectance
(ATR) Fourier Transform Infrared Spectroscopy (FTIR), Scanning
Electron Microscopy with Energy Dispersive Spectrometry (SEM-EDS),
Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC-MS), and
High Temperature GC-MS. The results from each of the techniques were
evaluated individually and in various combinations, via principal
components analysis (PCA) to determine their relative ability to distinguish
between the rolls of tape. With this information, an analytical scheme for
electrical tape was developed.
Preliminary results demonstrated that between the three brands of 3M
tape obtained directly from the manufacturer, elemental composition alone
can discriminate between the general-purpose brand and the professionalgrade brands. Initial experiments with chemical extraction of the plasticizer have shown that High Temperature GC-MS may be able to elucidate
more information about this particular component of electrical tape than
traditional methods have previously allowed (e.g. FTIR and Py-GC-MS).
Also in this study, FTIR methods examined in previous work were
employed to screen the samples and subsequent separations/extractions
provided further discrimination.
Electrical (PVC) Tape, Improvised Explosive Devices (IEDs),
Chemometrics
* Presenting Author
B95
Quantitation of Male/Female Mixed
DNA Samples Using the ABI PRISM®
7000 Sequence Detection System
Ashley J. Hinkle, BS*, Marshall University Forensic Science Graduate
Program, 1401 Forensic Science Drive, Huntington, WV 25701
Attendees will learn how the ABI PRISM® 7000 Sequence Detection
System, in conjunction with the Quantifiler™ Human and Quantifiler™ Y
Human Male DNA Quantification Kits, can be used to determine DNA
concentration in male/female mixed source samples.
humanity by describing a relatively new technology that can be
implemented in a forensics laboratory.
Mixed Male/Female DNA samples are often encountered in the
forensic laboratory. Quantitation of each DNA source in a sample can be
an important tool in interpreting the final STR profile. The Quantifiler™
Human and Quantifiler™ Y Human Male DNA Quantification kits, in
conjunction with the ABI PRISM® 7000 Sequence Detection System use
real-time PCR to amplify human and human-male DNA, respectively.
Male/female DNA mixtures of known ratios will be amplified with both
kits to determine the concentrations of total human and total male DNA
present in each sample. Theoretically, the difference between total human
DNA and total male DNA should equal the amount of total female DNA in
each sample. This project will determine if the ABI system can accurately
predict the amount of male/female DNA in a mixture.
Thirty-eight mixtures of male/female DNA were quantitated with both
the Quantifiler™ Human DNA and Quantifiler™ Y Human Male DNA
quantification kits developed by Applied Biosystems. When the female
contribution in a male/female mixture was the minor component and the
total DNA concentration was greater than approximately 1.48 ng/ l, the
female DNA concentration could not be accurately determined by
subtracting the total male DNA concentration from the total human DNA
concentration. When the male contribution in a male/female mixture was
the minor component, the presence of an excess contribution of female
DNA did not interfere with the performance of the Quantifiler™ Y Human
Male DNA quantification assay.
The Quantifiler™ Y Human Male DNA Quantification kit did not
produce linear results at higher DNA concentrations (greater than 20 ng/ l).
This non-linearity was reproducible, but varied in severity from assay to
assay. In addition, it cannot be understated how essential correct pipetting
techniques and properly calibrated pipettes are to accuracy and precision.
Small errors in pipetting can translate to substantial deviation in the final
quantitation results.
Quantifiler, Quantification, DNA
B96
Reducing Stutter Artifacts in Forensic
DNA Analysis Using Polyhydric Compounds
Elisabeth Schoneau, BS, Lindsey Wander, BS, and Sulekha R.
Coticone, PhD*, California State University, Fresno, 2555 East
San Ramon Avenue, Fresno, CA 93740
Attendees will learn improvements in the analysis of short tandem
repeats in DNA typing.
humanity by improve methods in analysis of DNA typing.
Current methods for PCR amplification of short tandem repeat (STR)
loci result in an artifact named “Stutter.” These stutter products are shorter
than the target allele by multiples of the repeat unit. Due to the presence of
the stutter artifact, multipeak patterns are obtained with STRs which results
in complication in the interpretation of results specifically in mixture
analysis in forensic samples and measuring microsatellite instability in
cancer diagnosis.
* Presenting Author
Polyhydric compounds and specifically polyols have been shown to
increase the thermal stability of proteins under stressful conditions.
Additionally polyols have been shown to interact with the polynucleotide
solvation sites replacing water surrounding the double helix. Due to the
combination of the functions of polyols mentioned above, the processivity
of the enzyme may be enhanced by the presence of the polyols during the
amplification of short tandem repeats. A screening method has been
developed to measure the effect of polyhydric compounds on reducing the
stutter artifact. The screening method involves the use of a PCR fluorescent multiplex system specifically used for detecting DNA in Forensics.
The multiplex system (Profiler Plus ID) is combined with the use of various
polyhydric compounds. Following PCR using the fluorescent multiplex
the products are analyzed on a capillary electrophoresis system (ABI Prism
310) and detected using the Gene Mapper ID software system. The results
are determined based on stutter percentage ratios. The stutter percentage
ratio is defined as the ratio of the stutter allele to the main allele peak.
Among the polyhydric compounds tested, there was a 2-20% decrease in
stutter as compared to the control in all loci. Arabinose, sorbitol, glucose
and sucrose contributed to the maximum decrease in stutter reduction.
Further studies include varying the concentration of the polyhydric compounds and testing osmolytes for further reduction in the stutter artifact.
This will improve genotyping and allele assignment of microsatellites by
eliminating errors in genotyping thereby improving the sensitivity of the
technique. In the forensic field specifically samples containing mixtures of
DNA samples will be easier to decipher simplifying analysis.
STRs, Stutter, Polyols
B97
Using Microscopy to Predict Success or
Failure of a Differential DNA Extraction
Julie E. Golden, MS*, Jefferson Parish Coroner’s Office, 2018 8th Street,
Harvey, LA 70058
Attendees will learn the results of a study examining the usefulness of
microscopy in order to predict the success or failure of a differential DNA
extraction.
humanity by demonstrating that microscopic evaluation of sexual assault
evidence is a valuable tool for determining whether or not the traditional
differential DNA extraction method will be effective.
Differential DNA extraction is a commonly used method of examining sexual assault evidence in the forensic DNA laboratory. This
extraction method allows the DNA analyst to chemically separate sperm
donor DNA from epithelial cell donor DNA resulting in two fractions. A
differential extraction failure is defined as incomplete removal of the
epithelial cell portion of the sample from the sperm cell fraction resulting
in a DNA mixture of the two donors or the presence of the epithelial cell
donor only in the sperm fraction. A sperm cell fraction that results in a
mixture of epithelial and sperm donor DNA can be problematic when performing statistical analysis of the sample; decreasing the weight of the
DNA test results in court. In addition, sperm cell fractions resulting in
mixtures can make productive searches of DNA databases, such as CODIS,
more difficult.
Microscopic slides have been prepared from 325 vaginal swabs.
These slides have been stained via the traditional Christmas tree staining
procedure and examined microscopically. The number of epithelial cells
and the number of sperm cells was rated for each slide. In addition, DNA
from the vaginal swabs has been extracted using a traditional organic differential procedure. The sperm cell fractions of these extractions have been
amplified using the AmpFISTR Profiler Plus and COfiler amplification kits and analyzed via the ABI Prism 310 Genetic Analyzer. The
resulting sperm fraction DNA profiles were examined in conjunction with
the microscopic data in order to determine the correlation, if any, between
the microscopic data and the mixed or single source nature of the DNA
profile results.
79
The findings of this study show that microscopic ratings indicating a
large number of epithelial cells regardless of the number of sperm cells
cannot predict a failure of the standard differential DNA extraction
procedure. Likewise, microscopic ratings indicating a small number of
sperm cells regardless of the number of epithelial cells also cannot predict
a failure of the differential DNA extraction procedure. However, samples
that contain both a small number of sperm cells and a large number of
epithelial cells will result in a failure of the differential DNA extraction
procedure in 70% of cases.
A modification of the standard organic differential method was
utilized on a subset of 20 samples that originally resulted in a sperm
fraction DNA mixture. However, adding an additional aliquot of
Proteinase K during the epithelial cell digest and increasing the number of
sperm cell washes only improved samples with microscopic ratings
indicating larger numbers of sperm present. This modification did not
increase the likelihood of obtaining a single source sperm fraction for
samples with the characteristic microscopy (low sperm/high epithelial)
indicating a mixed DNA profile is likely. Therefore, these results indicate
that perhaps epithelial cell DNA is bound somehow to the sperm heads or
is in some other way difficult to remove from the sperm fraction via the
traditional procedures.
This study has demonstrated that microscopic evaluation of sexual
assault evidence is a valuable tool for determining whether or not the
traditional differential DNA extraction method will be effective. If an
effective alternative differential DNA extraction method was available,
samples identified via microscopic evaluation likely to result in sperm cell
fraction mixtures using the traditional organic method could be diverted,
thereby increasing the number of single source sperm fraction profiles.
DNA, Mixture, Microscopy
B98
Development of a Semi-Automated Robotic
Platform for the Extraction of Forensic
Evidentiary Samples Using the Tecan
Genesis 150
David E. Sipes, MS*, Jason E Kokoszka, PhD, Jonathan Freedman, BS,
and Robin W Cotton, PhD, Orchid Cellmark, 20271 Goldenrod Lane,
Attendees will learn a cost-effective, semi-automated robotic
extraction platform designed to improve throughput and reduce the labor
costs commonly associated with manual extraction procedures.
humanity by providing the forensic community with a method by which to
implement a robotic extraction platform.
With the vast number of backlogged evidence samples and the
infusion of NIJ funding with which to process these samples, the forensic
DNA community has been challenged to develop a higher throughput
approach to sample processing in response to a growing demand for its
services. While the utility of robotic platforms has been clearly demonstrated in clinical laboratories and more recently in the extraction of
forensic database samples, automated DNA extraction techniques have
now broadened in scope to include forensic evidence samples. Robotic
alternatives to the conventional manual techniques must be designed such
that the automated systems are as adept at handling the diverse variety of
forensic samples as their manual extraction counterparts. Previous
validation studies in the laboratory and others have demonstrated that the
Qiagen DNA extraction kit is a suitable alternative to the organic method
of DNA extraction. It was the objective of this validation to develop a
robotic alternative to the liquid handling steps in the Qiagen DNA
extraction protocol.
After the manual addition of lysis buffers to the sample and the
subsequent incubation, the lysates are then transferred to the Tecan Genesis
150 for the remainder of the Qiagen procedure. When the extraction is
80
complete, the samples are eluted in a microtiter plate and an aliquot of the
extracted DNA is robotically transferred to a second plate for quantitation.
Because the customary elution volume from the Qiagen column is 200ul,
evidence samples are subsequently concentrated using a plate-based
microcon. Standard samples usually contain sufficient quantities of DNA
and no further concentration steps are necessary. All of the liquid transfer
steps in the Qiagen DNA extraction protocol have fixed volumes with no
variation from sample to sample. When the volumes vary (i.e., quantitation
setup), a worklist containing sample specific volumes and well locations is
generated by an internal LIMS system and is exported to the Gemini
(Tecan) software.
Ensuring that the robotic sample handling schematic is free of contamination is at the forefront of the developmental process. Once the liquid
transfer steps were defined and the instrument performance files were optimized, the deck layout was designed to facilitate the most efficient
movement of the robotic arm as well as to minimize the occurrence of tips
crossing over open sample tubes and reagent troughs. Because of the wide
variety of DNA amounts encountered in evidence samples, a comprehensive contamination study was performed to ensure that any occurrences
of contamination would be detected. A series of runs using highly concentrated DNA samples arranged in a checkerboard pattern were performed to
detect contamination that may have occurred during robotic processing.
To evaluate the efficiency of the robotic versus manual extraction
method, lysates from individual samples were evenly divided into two
tubes. One tube was extracted manually and the other robotically. A quantitative comparison of DNA recovery showed no significant differences in
recovery between the robotically extracted samples and those that were
extracted manually.
While the immediate benefits of extraction automation can be realized
in terms of reduced labor cost and higher throughput, the downstream
advantages are often overlooked. By eluting samples in a microtiter plate
format, subsequent plate-based sample transfers (i.e., amplification and/or
instrument sample preparation) are more readily performed using a multichannel pipette, improving efficiency and precluding the need to label
tubes.
This poster will show that the extraction efficiency of the Qiagen kit
coupled with the versatility of the Tecan Genesis Liquid Handling robot
makes the extraction of standard and evidence samples very amenable to
automation. Additional automation considerations including low volume
pipetting, optimization of liquid classes and the judicious choice of deck
layout will be presented.
Tecan Genesis, Qiagen, Automated DNA Extraction
B99
A Comparison of Y-STR Multiplexes
Cassie L. Johnson, MS*, Orchid Cellmark, 2600 Stemmons Freeway,
Suite 133, Dallas, TX 75207; Ryan Reynolds, BS, UNTHSC, 3500 Camp
Bowie Boulevard, Fort Worth, TX 76107; and Rick W. Staub, PhD,
Orchid Cellmark, 2600 Stemmons Freeway, Suite 133, Dallas, TX 75207
Attendees will learn how various Y-STR multiplexes compare to one
another and their applicability to forensic casework.
humanity by providing an understanding the available types of Y-STR kits
and their advantages/disadvantages will enable crime laboratories to make
an informed decision when selecting a Y-STR multiplex.
Y-STR testing enables forensic DNA analysts to examine the male
contribution of an evidentiary sample without interference from female
DNA. This testing can be quite valuable for cases in which traditional autosomal STR testing has been unsuccessful or has yielded inconclusive
results. The proportion of forensic cases utilizing Y-STRs has increased as
DNA analysts, law enforcement agencies, and lawyers learn of the advantages of Y-STR testing. In response to the increased demand for Y-STR
analysis, several multiplexes have been developed to allow for the simultaneous amplification of Y-chromosome loci. The present study compares a
* Presenting Author
Y-STR 10-plex already employed in casework at Orchid Cellmark, as well
as two commercially available multiplexes (Applied Biosystems’ Y-Filer
and Promega’s PowerPlex®-Y). The sensitivity and reproducibility of
each multiplex, as well as analysis of female:male and male:male mixtures
has been examined. The advantages and disadvantages of each multiplex
as they relate to its applicability to forensic casework will also be presented.
Y-STR, Multiplex, DNA
B100 Evaluation of Poly(ethylene oxide) as a
High-Speed, High-Resolution Sieving
Matrix in Shortened Capillaries or
Microchips for Forensic STR Analysis
Joan M. Bienvenue, MS*, Kate Wilson, BS, Jerome P. Ferrance, PhD,
and James P. Landers, PhD, University Of Virginia, Department Of
Chemistry, Mccormick Road, Charlottesville, Va 22904
The goal of this research project is to demonstrate the use of poly(ethylene oxide) (peo) as a high-resolution sieving matrix for forensic analysis
of DNA.
humanity by discussing the evaluation of an alternative polymeric sieving
matrix for high-resolution separation of DNA, as well as its potential
inclusion in next-generation microchip technology for DNA analysis.
Capillary electrophoresis is now the sanctioned method for separation
and analysis of short tandem repeat (STR) fragments of DNA for forensic
application and genetic mapping. Increased speed, separation efficiency,
and automation have made the technique indispensable in the forensic
laboratory. In order to accomplish the high-resolution separations required
for STR analysis, a limited number of polymeric solutions have been
evaluated systematically for suitability in this application. Linear polyacrylamides have become the separation matrix of choice because of their
stability, reliability and ability to yield high-resolution separation DNA
fragments differing in length by a single base. However, the high cost of
commercial products, poor resolution over shorter capillary distances
resulting in longer separation times, and the high viscosity of some
polymers, has created the need to search for alternative sieving matrices.
Though current commercial products accurately and reproducibly separate
fragments with high resolution, in lengthy capillary systems, their cost and
separation efficiency over short distances become prohibitive when making
the shift from capillary-based separations to microchip-based systems.
These considerations become increasingly significant when attempting to
translate conditions from capillary-based methods to the microchip
platform, where channel length and total device area of are utmost
importance. As the forensic community moves towards fully integrated
micro devices capable of sample preparation and full genetic analysis,
choice of separation matrix will play a major role in device design, analysis
time, and ease of use. Thus, as polymers are evaluated using capillary electrophoresis, attention must be paid to the feasibility of the sieving matrix
for microchip-based analysis. Critical evaluation of polymer viscosity,
resolution over short distances, device preparation, reproducibility of
separations, ease of polymer preparation, and cost of analysis must occur
when developing a polymer for separation of STR fragments for forensic
genetic analysis with the goal of translation to the micro device.
The work presented here describes the evaluation of poly(ethylene
oxide) (PEO), an inexpensive, commercially-available polymer, for
separation of STR fragments in capillaries and potentially for inclusion in
the microchip platform. Accurate, repeatable separations of STR fragments
with single base pair differences are reported using a denaturing, lowviscosity, low-molecular weight solution of PEO. The effects of buffer
composition, capillary temperature, polymer weight and concentration and
capillary length are described. A variety of polymer weights are explored
at varying concentrations to determine the polymeric conditions that result
* Presenting Author
in the highest resolution separation. Shortened capillaries were used to
simulate separation lengths similar to feasible microchannel lengths in
analytical microdevices for evaluation of polymer properties.
Reproducibility of the separation is evaluated, as well as the use of epoxypoly(dimethylacrylamide)(EPDMA)-coated capillaries for minimization of
electroosmotic flow (EOF). Urea concentration and capillary temperature
are also evaluated and optimized conditions for high-resolution separation
of samples in shortened channels are presented. Comparisons of PEO to
conventional commercial products are highlighted and the appropriateness
of this sieving matrix for translation to the microdevice is appraised.
DNA, Capillary Electrophoresis, Microchip
B101 Mexican (Chiuahua) Population
Data for the 15 STRs Loci Included
in the Identifiler Kit
Luis J. Martinez-Gonzalez, MS, Laboratory of Genetic Identification,
Department of Legal Medicine, University of Granada, Granada, GR
18012, Spain; M. Moguel, MS, State of Chihuahua DNA Laboratory, D.G.
Servicios Periciales, Chihuahua, Mexico; E. Martinez-Espin, MS,
Laboratory of Genetic Identification, Department of Legal Medicine,
University of Granada, Granada, 18012, Spain; C. Entrala, PhD, J.C.
Alvarez, MS, and F. Fernandez-Rosado, DDS, Laboratory of Genetic
Identification, Department of Legal Medicine, University of Granada,
Granada, 18012, Spain; José A. Lorente, MD, PhD*, University of
Granada, Department of Legal Medicine, Av. Madrid, 12, Granada,
18012, Spain; Miguel Lorente, PhD, and E. Villanueva, MD, Laboratory
of Genetic Identification, Department of Legal Medicine, University of
Granada, Granada, 18012, Spain; and Bruce Budowle, PhD, FBI, FBI
Academy, Quantico, VA 22135
The goal of this presentation is to present the results and parameters
of forensic interest (HWE, PD, PE) of the Mexican population for the 15
STR loci included in the Applied Biosystems Identifiler kit.
humanity by demonstrating data of great interest for the forensic community, since they are necessary to perform statistical calculations, both in
the paternity and forensics fields, after DNA identification analysis.
The 16 STR loci D3S1358, TH01, D21S11, D18S51, D5S818,
D13S317, D7S820, D16S539, CSF1PO, vWA, D8S1179, D2S1338,
D19S433, TPOX & FGA, and the locus amelogenin can be amplified
simultaneously using the the Identifiler kit (Applied Biosystems, Foster
City, CA, USA).
This paper presents allele distribution data in the Mexican population
of the State of Chihuahua, Northern-Central part of the country. Whole
blood was obtained from 161 unrelated volunteers and spotted on FTA
paper (Whatman, USA); all individuals were actual residents along the
state of Chihuahua, Mexico. Extracted DNA samples were amplified at the
16 loci using the Identifiler kit. Samples were analyzed using the ABI
Prism™ 310 Genetic Analyzer (PE Biosystems, Foster City, CA) according
to the manufacturer’s recommended protocol.
All 15 loci are highly polymorphic in the Mexican sample population with the locus TPOX (55.3%) having the lowest observed heterozygosity, and the locus D2S1338 (88.8%) displaying the highest heterozygosity. The most discriminating loci were D18S51 (PD=0.969) and FGA
(PD=0.968). The combined probability of exclusion for the 15 STR loci
is 0.99999926. There was little evidence for departures from HardyWeinberg expectations (HWE) in this sample population. Based on the
exact test, the loci that departed significantly from HWE were D31358
and D13S317. After employing the Bonferroni correction for the number
of loci analyzed, these observations are not likely to be significant. An
inter-class correlation test analysis was performed to detect any correlations between alleles at any of the pair-wise comparisons of the 15 loci. A
resume of the PD and PE are shown in the following table:
81
Locus
PD (Obs)
PD (Exp)
PE
1 D8S1179
2 D21S11
3 D7S820
4 CSF1PO
5 D3S1358
6 THO1
7 D13S317
8 D16S539
9 D2S1338
10 D19S433
11 vWA
12 TPOX
13 D18S51
14 D5S818
15 FGA
0.92805062
0.94649126
0.91709425
0.85112457
0.91007291
0.90675514
0.93368311
0.92789630
0.95675321
0.92889935
0.90289726
0.79086455
0.96909841
0.85405656
0.96801821
0.92517508
0.95136413
0.91988693
0.86167114
0.91709457
0.91223821
0.94236962
0.93190281
0.96159279
0.94148490
0.91729619
0.79308289
0.97232966
0.88179848
0.97219246
0.59304848
0.66976540
0.57759331
0.45289261
0.57058241
0.55668406
0.64004831
0.60855433
0.70663845
0.63921864
0.57252133
0.36674141
0.75147290
0.49866824
0.75055161
Total
>0.99999999
>0.99999999
0.99999926
In conclusion, a Mexican – Chihuahua database has been established
for the loci D3S1358, TH01, D21S11, D18S51, D5S818, D13S317,
D7S820, D16S539, CSF1PO, vWA, D8S1179, D2S1338, D19S433,
TPOX & FGA. All loci are highly polymorphic. The application of the
product rule is valid for estimating the rarity of a multiple loci profile for
these 15 loci.
with these cleaners. Some of these substrates also were treated with either
latex or oil based paint in order to determine the ability of the process to
detect blood covered by paint. Some substrates also were exposed to
environmental conditions for a period of seven days in order to determine
potential effects on KPS fluorescence.
All of the substrates also were tested using the presumptive tests that
employ phenolphthalin or Hemastix strips in comparison with KPS
Fluorescein. It was determined that KPS Fluorescein and phenolphthalin
sensitivity are comparable, but KPS Fluorescein exhibited cross-reactivity
with some cleaning products. Hemastixs were observed to have the greatest
sensitivity for blood detection, but exhibited a high frequency of cross-reactivity with a variety of substances. KPS Fluorescein consistently detected
blood under latex paint on wood. These substrates were retested at later
intervals (i.e., 3 months and 6 months) after KPS Fluorescein treatment,
and continued fluorescence was observed at these later times.
Both cuttings and swabbings were collected from these samples and
processed by DNA extraction and subsequent STR analysis. It was
determined that samples that were cut, rather than swabbed for DNA
extraction, yielded higher levels of DNA and complete STR profiles. It was
determined that KPS Fluorescein does not alter the ability to obtain DNA
profiling results.
Fluorescein, Blood, DNA
STR, Identifiler®, Mexico
B103 Obtaining Typable DNA From Bloodstains
That Serologically Test Negative
B102 A Comparison of KPS Fluorescein
to Other Presumptive Blood Identification
Techniques and Its Effects on PCR
Based DNA Analysis Methods
Katie L. Coy, BS*, and Kristen E. Lewis, BS, Virginia Commonwealth
University, 1000 West Cary Street, PO Box 842012, Richmond, VA 23284;
Ashlee Fulmer, MFS, and Amy Hudson, MFS, The Bode Technology
Group, Inc., 7364 Steel Mill Drive, Springfield, VA 22150; and Tracey
Dawson Cruz, PhD, Virginia Commonwealth University, 1000 West Cary
Street, PO Box 842012, Richmond, VA 23284
Heather J. Seubert, BS*, and Rhonda Craig, MS*, FBI, DNA Analysis
Unit I, Room 3230, 2501 Investigation Parkway, Quantico, VA 22135;
Jeffrey Leggitt, MS, FBI, Chemical-Biological Science Unit, 2501
Investigation Parkway, Quantico, VA 22135; Gabor Patonay, PhD*,
Georgia State University, Department of Chemistry, University Plaza,
Atlanta, GA 30303-3083; Kyle A. Hoskins, BS*, and Tani G.
Watkins, BA*, Michigan State Police, Bridgeport Laboratory,
PO Box 608, Bridgeport, MI 48722; Kevin W.P. Miller, PhD, and
Rachael Bartholomew, PhD, FBI, Counter Terrorism and Forensic
Science Research Unit, FBI Academy, Quantico, VA 22135; and
Richard Guerrieri, MS, FBI, DNA Analysis Unit I, Room 3230,
Quantico, VA 22135
The goal of this presentation is to make the forensic community aware
that typable DNA may be extracted from bloodstained material even when
negative presumptive and/or confirmatory test results are obtained.
humanity by changing collection and screening protocols and/or interpretation guidelines for biological evidence testing to assure that valuable
forensic evidence is not overlooked.
The goal of this presentation is to make the forensic community aware
that typable DNA may be extracted from bloodstained material even when
negative presumptive and/or confirmatory test results are obtained. This
research project was undertaken to determine if typable loci could be
obtained from washed and treated bloodstains and how these results
compare to serological results, specifically with the ABAcard HemaTrace
confirmatory test.
Human blood was diluted down to a concentration of 1:500 (undiluted, 1:20, 1:100, 1:250, 1:500), applied to a cotton t-shirt, and then subjected to treatments of machine washing in water, Tide, or bleach. Each
sample was then tested using the confirmatory ABAcard test. DNA was
extracted by traditional organic methods (phenol/chloroform) followed by
quantification of human DNA by the Quantiblot method. Multiplex STR
amplification was performed using the ABI AmpFlSTR® Profiler Plus
PCR kit. The resulting PCR products were separated and detected by capillary electrophoresis on the ABI 3100Avant Genetic Analyzer and data
analysis performed using ABI GeneScan and Genotyper software.
The untreated whole bloodstains and undiluted Tide-treated
bloodstains were the only samples to produce a positive reading for
hemoglobin with the ABAcard test. All other treated and untreated diluted
bloodstains gave a negative ABAcard result after washing. However,
previously published reports suggest that the ABAcard tests are quite sensitive and possibly able to test positive for whole blood or bloodstains that
have been diluted down to 1:1,000,000. Thus, it is noted that traditional
Attendees will gain an awareness of another chemical enhancement
tool for detecting blood stains and its effects on PCR Based DNA analysis
methods.
humanity by providing another tool to the forensic community when
searching for blood stains.
This study was designed to examine the following factors involved
with processing evidence for blood staining: 1) to determine if KPS
Fluorescein is more sensitive for blood detection than other presumptive
tests, 2) to determine if KPS Fluorescein will result in false positives by
cross-reacting with various substrates or cleaning products, and 3) to
determine if the use of KPS Fluorescein will adversely affect the quality of
STR-based DNA profiles developed subsequently.
Dilutions of blood were applied to substrates such as dry wall
samples, treated and untreated wood samples, and carpet samples. Some
of these substrates were then cleaned with typical household cleaners such
as Joy Dishwashing Detergent and Clorox Bleach to determine the ability
of the process to detect blood as well as assess potential cross reactivity
82
* Presenting Author
washing procedures (regardless of treatment) can significantly alter the
hemoglobin molecule such that negative results may be shown even when
stain extracts actually contain human blood.
Results from the DNA profiles indicated that typable DNA was
present in many of these treated and diluted bloodstain samples that
initially tested negative using the ABAcard confirmatory test. While
negative ABAcard results were obtained for all but two stains (undiluted,
untreated and undiluted Tide-treated bloodstains), complete or partial STR
profiles were obtained from all untreated stains (all dilutions) and several
of the treated stains (bleach or Tide). In washed, untreated whole bloodstains, complete profiles were easily generated. In addition, partial profiles
(>50% of STR loci successful) were obtained from untreated bloodstain
samples that had been diluted down to 1:500. Interestingly, complete
and/or partial profiles were also generated from the Tide-treated samples
that were either undiluted or diluted down to 1:20. Furthermore, the undiluted bloodstains that were treated with bleach yielded a near complete
profile, generating successful results at an average of 89% of all STR loci
tested despite the fact that the confirmatory blood serology test on those
bleach-treated samples had yielded negative results. This was a significant
and unexpected finding because bleach is thought to severely denature
most biological molecules, including DNA. Many additional trends were
noted with the data generated from these experiments. As one may anticipate, the severity of DNA degradation increases with harsher treatment and
along with that, the heterozygote balance decreases, the peak intensity
diminishes, and the larger alleles are more prone to allelic dropout.
The data produced from these experiments show that confirmatory
serology tests are not always reliable predictors of successful STR amplification. Because confirmatory tests such as the ABAcard may often be used
in the field and the laboratory to determine what biological evidence to
collect and submit for DNA analysis, a negative reading could (in some
labs) prevent DNA analysis and thus result in lost forensic evidence. This
research demonstrates the value of performing multiple serological
screening tests prior to DNA analysis, as well as cautiously interpreting
negative results, as typable DNA may be present at trace levels even when
the serological protein marker is present at levels below the limits of
detection for that test. Further research could investigate amplification of
these treated samples using methods designed to detect low copy number
DNA since these samples have limited quantities of DNA that vary in
quality, similar to what is commonly seen in forensic case samples.
DNA, STR, ABAcard HemaTrace
B104 Decontamination of Bacterial Spores
Without Affecting DNA Molecular Analysis
James M. Robertson, PhD*, Douglas L. Anders, PhD, and Douglas J
Beecher, PhD, FBI Academy, Laboratory Building, Quantico, VA 22135;
and Julie Nicholson, MFS, Donia P Slack, MS, Francene Basalyga, MS,
and Robert A Bever, PhD, The Bode Technology Group, 7364 Steel Mill
Drive, Springfield, VA 22150
After attending this presentation, attendees will realize that protocols
can be used to kill bacteria without destroying the ability to molecularly
analyze the DNA contained within the organism.
humanity by giving attendees a validated procedure for decontamination
without destroying the DNA. The value of this approach is to preserve
evidence while allowing clean up in cases where bacteria may be present.
In addition, if decontamination has taken place in a rogue laboratory, there
may still be evidence that can be evaluated for its DNA signatures. The evidence should not be discarded in such cases.
Following the accidental or intentional release of pathogens, surfaces
become contaminated and must be treated with a chemical agent to kill the
organisms. In rogue laboratories, where pathogens are cultured for criminal
or terrorist acts, the perpetrators may decontaminate surfaces and
* Presenting Author
equipment used to grow the organisms in order to destroy evidence.
Although the non-viable pathogens cannot be characterized by their growth
characteristics following decontamination, the question remains whether
the DNA inside the cells can still be utilized in assays for identification and
attribution. Thus, there is a requirement to determine the effects of common
decontamination procedures on the activity of DNA in downstream
analyses. Research was performed to characterize the effect of several
decontamination procedures on DNA as determined by PCR and restriction
enzyme analysis. Bacterial spores of Bacillus cereus, a simulant for B.
anthracis, were chosen for the studies, because these are very challenging
organisms to kill and thus require rigorous decontamination procedures to
effect a standard kill of 6-logs in concentration. Suspensions of organisms
and dried deposits of the organism on various materials and surfaces of
forensic relevance were examined. Manufacturer’s suggested protocols,
CDC (paraformaldehyde), and EPA (bleach) protocols were followed to kill
the organisms. The materials examined included tile, wood, carpet, cubicle
cloth, and painted dry wall. Real-time PCR and pulsed field gel
electrophoresis (PFGE) were performed to evaluate the effects on both
amplification and restriction digestion, respectively.
It was found that 10% bleach was effective in killing the spores at both
pH 7 and pH 11, but the matrix on which the organisms were deposited
significantly affected the ability to kill the spores. Actril (a mixture of
peroxyacetic acid, hydrogen peroxide, and acetic acid), a commercial agent
used in hospitals, was as efficient at killing spores as bleach. Actril worked
well on all the surfaces and materials tested. DNA extracted from spores
exposed to Actril can be amplified more efficiently and consistently than
DNA extracted from spores exposed to bleach. PFGE did not reveal
differences between the untreated control and Actril-treated spores.
Paraformaldehyde (which is converted to formalin gas during the
procedure) was very effective, but the DNA was minimally useful for
molecular analyses. L-gel, a decontaminating agent reported to be capable
of destroying both chemical and biological warfare agents, was not very
effective on the spores when the agent was spread over the sample. DNA
could be subsequently amplified from the recovered organisms treated with
L-gel, but it could not be ruled out that this DNA was derived from cells
that remained viable. Sterilox could kill the spores, but the efficacy of this
agent was highly affected by the matrix on which the spores were
deposited. The DNA was not damaged by Sterilox treatment of the spores.
Actril and bleach are the most effective sporicidal agents, and Actril has the
least effect on the molecular assays.
A validated protocol for the detection of bacteria collected from different surfaces that have been decontaminated by a variety of processes will
be presented.
Decontamination, Nucleic Acid Amplification/Digestion, Pathogenic
Microorganisms
B105 Enzymatic-Mediated Digestion of Cellulose
for Enhanced Cell Elution for DNA Analysis
Jessica C. Voorhees, MSc*, Jerome P. Ferrance, PhD, and James P.
Landers, PhD, University of Virginia, Department of Chemistry,
McCormick Road, Charlottesville, VA 22904
The focus of this project is the development of an improved method
for the elution of cells from a cotton swab taken from a sexual assault
victim. The procedure incorporates enzymes for the digestion of the
cellulose matrix, resulting in the removal of intact cells, in an effort to
circumvent conventional differential extraction.
Genetic analysis of perpetrator and victim mixed profile DNA
samples obtained from vaginal swabs is a well-established technique in the
investigation of sexual assault and rape cases. Unfortunately, the procedures involved in a typical forensic DNA analysis require a great deal, of
laboratory time dedicated to a single case, particularly in the sample preparation steps. Because of the time and funding constraints involved in the
83
investigation of such cases, a significant backlog exists in many largevolume DNA analysis laboratories.
The current protocol used by law enforcement agencies for recovery
of cellular materials from a cotton matrix involves a great deal of sample
handling, which directly increases the chances of sample contamination
and human error. Furthermore, it is a time-consuming process often
requiring overnight incubation of a swab sample for optimal DNA
recovery. The extraction solution used in the recovery of DNA from swabs
includes proteinase K in the presence of SDS, a combination that
selectively lyses the fragile epithelial cells while eluting sperm cells intact.
The solution is then centrifuged to pellet the sperm cells, removing them
from the solution containing the victim DNA, allowing independent
genetic analysis of male and female DNA.
The time required for forensic DNA analysis can be greatly reduced
by performing the electrophoretic separation on microfabricated glass
devices. The speed and efficiency of microchannel separations are due
largely to the increased surface to volume ratio of the etched-channels over
conventional slab gels. In addition, these devices allow for the integration
of additional processing steps, including sample preparation methods.
Because centrifugation on a microchip is not trivial, a microchip method
for isolating separate male and female DNA fractions has been proposed.
This method relies on recovery of intact cells from sample swabs, thus a
cell-desorption process that greatly reduces extraction time while leaving
cells intact would be advantageous for developing genetic analysis on a
micro-total analysis system (µ-TAS).
Microscopic examination of a cotton swab on which a semen sample
had been applied and allowed to dry suggested that sperm retention on the
swab was due to adhesion of sperm cells on the surface of polysaccharide
cellulose strands. Preliminary studies have shown that cellulase-based
enzymes, which digest cellulose, reduce the time required for sperm and
epithelial cells to be released from the swab into solution. In an effort to
optimize cellular elution conditions, several different enzymes were evaluated both alone and in combination. Sperm and epithelial cells eluted
from a cotton swab were counted using a hemacytometer. Results indicate
that elution using enzymes improved the recovery of sperm cells without
lysing epithelial cells, and enzymatic sperm cell desorption is greater than
that seen with current elution methods. Optimum cellular elution conditions using the enzyme cellulase will be presented. In addition, information
regarding the development of a receptacle that interfaces a cotton swab
sample with a µ-TAS on a microfabricated glass device will be discussed.
Cellulose, Elution, Enzyme
B106 Development of Multiplexed Microsatellite
Markers in Cannabis sativa
Heather L. Erek, BS*, Orchid Cellmark, 1400 Donelson Pike, Suite A-15,
Nashville, TN 37217; Tariq Mahmood, PhD, Alberta Research Council,
Hwy 16A & 75 Street, Vegreville, Alberta T9C 1T4, Canada; and José
Almirall, PhD, Florida International University, Department of
Chemistry, University Park, Miami, FL 33199
Attendees will learn that there is a genetic test to provide evidence of
cooperation in the production of cannabis.
The association of cannabis to sellers, growers and buyers could track
networks and show common orgin. This presentation will impact the
forensic community and/or humanity by broadening the scope of the DNA
analyst and give a genetic test to drug chemists.
Cannabis sativa L. (marijuana) is the most frequently used illegal
drug in the United States. The marijuana plant can be easily identified
through morphological examination and chemical analysis; however there
is a need for a method to track distribution networks and to compare plants
to determine a common source of origin. A genetic test can enable this
association and provide evidence of cooperation in production.
Microsatellite markers have distinct advantages over other genetic
84
methods. They have multiple alleles at a single locus, they are reproducible
between laboratories, they have a high discrimination power and they can
be multiplexed. In this project, a set of Cannabis STR primers previously
described by the group and a set of STR primers previously described by
Gilmore’s group in Australia were combined and multiplexed into two
reactions. The primers include nine trinucleotides, one compound trinucleotide and one imperfect trinucleotide. Both hemp (low THC) plants and
marijuana (high THC) plants from different regions of the United States
and multiple countries will be tested with the multiplexed primers. The
previous studies using these microsatellite markers were able to distinguish
clones from non-clones. Efforts are underway to construct a comprehensive genomic map of Cannabis sativa, where the positions of these
micorsatellite loci on various chromosomes/linkage groups could be
defined.
The goal of this project is to determine the level of polymorphism, to
show the usefulness for DNA fingerprinting and to measure the genetic
relationships between different Cannabis plants, all using a practical set of
reactions that can be performed in an operational forensic laboratory.
Cannabis Sativa, Multiplexed Microsatellites, STR Primers
B107 Evaluation of Track-Etch Filters for
Isolating Sperm DNA in Rape Kits
Carll Ladd, PhD, Eric J. Carita, MS*, and Elaine M. Pagliaro, JD,
Connecticut Forensic Laboratory, 278 Colony Street, Meriden,
CT 06451; Alex Garvin, PhD, Bureco Corporation, 18 Gewerbestrass,
Allschwil, CH-4123, Switzerland; Timothy M. Palmbach, JD, University
of New Haven, 300 Orange Avenue, West Haven, CT 06516; and
Henry C. Lee, PhD, Connecticut Forensic Laboratory, 278 Colony Street,
Meriden, CT 06451
The goal of this presentation is to evaluate the efficacy of track-etch
filters as an alternative approach to the standard selective lysis protocol for
isolating sperm DNA profiles from sexual assault samples
humanity by providing the forensic community with a tool to evaluate the
effectiveness of track-etch filter for the processing of rape kit evidence.
The large number of unprocessed sexual assault cases nationwide
constitutes an ongoing concern for the forensic community. Many of these
cases have sufficient numbers of sperm to generate DNA profiles that could
be used to query the CODIS database and identify rape suspects. The
standard method for purifying sperm from these swabs is to first resuspend
the sample and to selectively digest the epithelial cells with Proteinase K.
The intact sperm are then separated from the contaminating solubilized
DNA by centrifugation, careful removal of supernatant, and extensive
washing of the sperm pellet, all steps that are difficult to automate. The
authors have evaluated a vacuum driven filtration method as an alternative
approach for separating sperm from digested epithelial cells that is more
easily automated in a 96 well format. First, the sample is digested with
Proteinase K for 1 hour at 56oC (in standard DNA extraction buffer).
Sperm are collected on 2 micron track-etch filters, while the epithelial cell
DNA is collected in the filtrate (vacuum pressure = 300 torr). The filters are
then washed, and the sperm DNA is solubilized with a reducing agent and
collected in the filtrate. The goal of this project is to optimize and validate
a faster, more effective, less-labor intensive, and more cost-effective
method to isolated sperm DNA from sexual assault samples to address the
backlog of unprocessed biological evidence.
Mock body fluid sample mixtures (5,000-100,000 sperm per swab)
were processed by the vacuum filtration method and the standard differential
extraction procedure to determine their ability to separate the male profile
from the female profile using the Profiler Plus and COfiler STR kits from
Applied Biosystems, Inc. Various parameters were tested to optimize the filtration method including efforts to overcome the recurring problem of filter
clogging. These efforts included introducing centrifugation and filter
* Presenting Author
washing steps, using 10 micron pre-filters to remove cell debris, prewarming washing reagents, using different reducing agents (BME and DTT,
various concentrations), adding additional Proteinase K, and slowly adding
the sample to the track-etch filter. Membrane clogging can be overcome by
centrifuging (3000 G) the sample through the membrane in lieu of vacuum
filtration. However, both approaches are less sensitive than the standard differential method and the centrifugation steps are not easy to automate.
The authors have shown that use of track-etch filter can be effective for
identifying the DNA profile of the semen donor from mixed body fluid
samples. To date, the efficiency of separation using track-etch filter has been
variable and the method is not as sensitive as the standard differential
procedure.
This project has been funded by the National Institute of Justice, Grant
#2003-IJ-CX-K103
B109 “Taking a Bite Out of Crime”:
STR Typing of Biological
Evidence Left on Food Remnants
Ismail M. Sebetan, MD, PhD*, and Heather A. Zarsky, MFS, Forensic
Sciences Program, National University, 11355 North Torrey Pines Road,
La Jolla, CA 92037
Attendees will learn of a single STR locus, SE33, that can be used as
a DNA-based screening method for heavily bloodstained evidence.
A single STR locus such as SE33 can be used to screen heavily bloodstained evidence thus greatly reducing the number of samples requiring a
full 16 loci profile. This presentation will impact the forensic community
and/or humanity by providing a faster and more cost effective method for
forensic laboratories.
Forensic laboratories typically identify biological fluids and then, if
warranted, the analyst performs DNA analysis to generate a 16 loci genetic
marker profile. In most cases this is the most efficient way of processing
the case; however, in cases where a large amount of bloodshed has occurred
it is time consuming, costly, and it may not be necessary to generate a full
16 loci profile for every stain. In these types of cases it is often necessary
to test numerous stains to find the one most probative stain for DNA testing.
A faster and more cost effective method would be to screen heavily bloodstained evidence with a single DNA locus to determine if the stain is probative and warrants the full 16 loci testing. HUMACTBP2 (SE33) located
on chromosome 5 or 6 is a highly polymorphic STR locus (AAAG repeat
sequence) with 32 alleles in the range of 202-323 bp and is one of the loci
included in the European STR database, EDNAP. SE33 has numerous
microvariants; therefore, it is crucial to fine tune the procedure with regards
to the proper gel concentration needed to allow the 1-bp separations. In this
study SE33 (Promega’s kit) was extensively validated utilizing the ABI 377
and ABI 310 instrumentation. One hundred buccal swabs were collected
and extracted with Chelex, quantitated with QuantiBlot, amplified on an
ABI 2700 using 10/20 cycles, and separated on the 377 and 310. This validation included reproducibility/precision, sensitivity, mixture studies, past
proficiency samples, and environmental studies. The reproducibility
portion of the validation consisted of within-gel and between-gel analysis.
The sensitivity study included several sets of samples in the range of
0.03125ng to 5ng. The SE33 types obtained from samples in five proficiency tests were compared to results obtained on the FMBIO II. The
mixture study included several mixtures with the following ratios: 1:0, 1:1,
1:2, 1:4, 1:9, and 1:19. In the environmental study ten different blood
samples were applied to five substrates (denim, leather, silk, cotton, polyester blend) and exposed to a full year, including rain and snow, of northeastern Pennsylvania weather. The results presented will include the finetuned procedure and a comparison of samples analyzed on the 377 and 310.
Future work in this validation will include analysis of samples from nonprobative/no analysis casework. The SE33 types obtained from the
samples used in this validation will also be verified at a different laboratory.
The goal of this presentation is to demonstrate the amenability of bitten
foodstuffs to DNA profiling using current STR methodology and identifies
some of the limitations and problems that may be encountered when dealing
with food evidence. This research will provide an evaluation of the STR profiles obtained from different types of food possibly encountered at crime
scenes and a guide for crime scene investigators and police officers on what
kind of evidence should not be overlooked at a crime scene.
by showing that DNA typing from bitten foodstuffs is an efficient and reliable
alternative source for biological evidentiary samples, and identifies some of
the limitations and problems that may be encountered. These results can be
used to educate crime scene investigators and police officers on what kind of
valuable evidence should not be overlooked at a crime scene.
The advancement of DNA technology has increased the capability of
DNA profiling to a level in which its greatest boundary is innovation. It is
well known that the common biological fluids encountered at crime scenes
provide ample DNA for testing. However, in many cases analysis becomes
challenging due to the direct deposit of DNA on an unusual surface or item.
Bite marks are a piece of evidence that offer an odd, yet fairly common mode
of DNA transfer when dealing with burglary, larceny, robbery, and at times,
more serious and violent crimes. The number of cases involving bitten foodstuffs is increasing, suggesting a need to look into the DNA profiling of this
type of evidence.
A potluck was staged as a mock crime scene in which foods such as
pizza, corn on the cob, chicken wings and ribs, bite size Hershey’s peanut
butter cups, cheese, apple slices, and carrots were partially consumed and
remnants discarded. The unconsumed food commodities were swabbed for
biological evidence, analyzed for cellular material by microscopy followed
by organic extraction, concentration and quantification by slot blot. The
AmpFlSTR® Profiler Plus™ PCR Amplification kit was used for all PCR
reactions. Samples were concentrated to a final volume of 25 l of which 20 l
was used in the amplification reaction. Amplicons were electrophoretically
separated using the ABI Prism 310 Genetic Analyzer and analysis of raw data
and calling alleles carried out by GeneScan® and Genotyper® softwares
respectively.
The research results showed that high quality DNA could be extracted
with successful STRs typing was obtained. Analyses of the profiles outcomes
will be demonstrated. The presence of nucleated epithelial cells in preliminary microscopic results suggested that typing results could be obtained
from bitten food products. It was indeed seen that full DNA profiles (9 STR
loci + Amelogenin) were obtained from 43% of swabs collected, between 69 loci was seen in 33% of samples, 16% showed 1-5 loci and only 8% failed
to type at all. Profile variation based on food-type dependent factors (portion
size and eating style, food preparation and natural composition, and swabbing
location), are also discussed. Poor profile quality manifesting as allelic
dropout is attributed predominantly to PCR inhibition. Degradation and stochastic effects are also considered as sources of allelic dropout but only minimally. Mixed profiles as a ramification of improperly packaged samples are
also addressed.
In conclusion, this research has largely shown that STR typing of food
can be carried out in a highly successful manner, therefore when food evidence is available, DNA results should definitely be sought. Limitations due
to low DNA yield and presence of PCR inhibitors can be overcome to
produce high quality DNA profiles. Since cross transfer of cellular material
was readily evident in a number of samples, any and all occurrences of food
items touching must be noted while applying proper packaging protocol.
SE33, HUMACTBP2, DNA
Bite Mark, STR Typing, Foodstuffs
Track-Etch Filters, Sperm DNA Isolation, Differential Extraction
B108 Validation of SE33: A DNA-Based
Screening Method
Carol J. Ritter, MS*, Lawrence Quarino, PhD, Kristen Johnson, BS*,
Jennifer Sears*, Robin Shick*, and Katherine Henkelman*, Cedar Crest
College, 100 College Drive, Allentown, PA 18104
* Presenting Author
85
B110 Quality and Throughput From
a Highly Integrated, Automated
Casework Sample Processing Platform
Benoît Leclair, PhD*, Timothy D. Kupferschmid, MFS, Corey L.
Schwensen, MS, Stephen Gresko, BS, Victor Thompson, BS, Brian E.
Ward, PhD, and Tom Scholl, PhD, Myriad Genetic Laboratories, Inc.,
320 Wakara Way, Salt Lake City, UT 84108
Te attendee should have a clear understanding of what current automated sample processing technologies can do for current casework loads
and backlogs, in terms of process quality, flexibility and throughput.
Currently, long manual processing times give offenders ample opportunity to re-offend. Highly integrated automated solutions have the
potential to eliminate backlogs, provide quick turn-around on newly submitted cases, increase crime resolution rates, and deny repeat offenders the
opportunity to re-offend. Countless victims of violent crimes could be
spared their ordeal.
The demanding nature of forensic casework evidence makes of
sample processing a labor-intensive manual undertaking. Submissions of
criminal casework involving biological evidence currently exceed installed
processing capacity in numerous jurisdictions. It is currently estimated that
across the United States, over 500,000 criminal cases with biological
evidence are awaiting processing.
Highly integrated, automated biological specimen processing
platforms have been in use in high-throughput clinical and large-scale
genetic research facilities for many years, and more recently in felon
genotype data banking initiatives. These systems have reached a level of
maturity that warrants leveraging this experience into the casework sampleprocessing arena, despite the demanding nature of casework biological
evidence. This report presents the result of the development efforts towards
the implementation of highly integrated, automated casework sampleprocessing platform.
The development goals were to achieve performance standards
comparable to or better than a traditional manual process with regards to
genotyping results, sample consumption, process flexibility, and chain-ofcustody. In addition, the platform fully exploits process tracking,
throughput and scalability capabilities. The entire process is overseen by a
custom-built LIMS addressing the specific requirements of forensic
casework. It tracks samples, their derivatives and associated process-generated data from the moment the samples enter the facility. It controls all
robotic processes, ensures process integrity and sample tracking through
the extensive use of barcodes. It automatically computes quality metrics
and performs trend analysis to monitor / document process quality.
Experienced analysts manually search exhibits for biological stains.
According to the specifics of the case, cuttings enter the automated
processing platform under the “Differential” or “Non-Differential”
pathways. TECAN robotic liquid handlers perform all processes from cell
lysis to the production of capillary loading plates. Robot-based chemistries
are optimized to deliver quantitative DNA extraction yields from scarce
samples. DNA is extracted with ChargeSwitch para-magnetic beads, and
quantification is performed with the Quantifiler Autosomal and Y kits. All
commercial STR megaplexes are supported. The high precision, accuracy
and reproducibility of robotic pipetting contribute significantly to overall
process quality. The batching of samples for robotic processing yields
considerable efficiencies in process execution time.
To support process flexibility and minimal exhibit/extracted DNA
consumption, the LIMS provides the analyst with customizable re-work
pathways from any given step within the platform, as well as process
branch-off points to return a sample to offline processing. The LIMS incorporates numerous user interfaces that allow the analyst to follow / audit the
processing path of a sample and maintain total control on the processing of
samples. The entire system is built under a novel architecture that allows
for new processes or submitting agency preferences to be quickly
integrated, extensively tested and validated.
86
A complete developmental validation study was conducted according
to SWGDAM guidelines and demonstrated the reliability of the platform.
This presentation will showcase case examples processed by this high
quality, automated system.
Automation, Casework, Validation
B111 A Concordance Study Comparing
Different Amplification Chemistries
and Electrophoretic Platforms for a
Databasing Program
G. Sue Rogers, MSFS*, Alabama Department of Forensic Sciences,
501 12th Street South, Birmingham, AL 35233; Bridget Tincher, MSFS,
Marshall University, Forensic Science Center, 1401 Forensic Science
Drive, Huntington, WV 25701-3628; Angelo Della Manna, MSFS,
Alabama Department of Forensic Science, 501 12th Street South,
Birmingham, AL 35233; Terry Fenger, PhD, Marshall University,
Forensic Science Center, 1401 Forensic Science Drive, Huntington, WV
25701-3628; and Rhonda K. Roby, MPH, Identity Quest, LLC, 13203
Astoria Hill Court, Suite J, Germantown, MD 20874
The goal of this presentation is to present the results of an extensive
concordance study and collaboration performed by the Alabama
Department of Forensic Sciences (ADFS) and Marshall University
Forensic Science Center (MUFSC) in order to address the State of
Alabama’s backlog of convicted offender samples.
humanity by demonstrating that either multiplex reagent kit or instrument
platform can be effectively used to process convicted offender samples.
The study demonstrates that the procedures employed are robust and valid.
Furthermore, this study will present recommendations for the forensic
community regarding the interpretation of DNA profiles developed from
convicted offender samples and their subsequent entry into CODIS in order
to maximize the current searching algorithm to aid in the identification of
the perpetrators of violent crimes.
Concordant results using different fluorescent-based STR (short
tandem repeats) genotyping systems for the analysis and databasing of
convicted offender samples are critical for accurate matching to nonsuspect casework and to link serial crimes. In order for a state to upload its
database of convicted offender DNA profiles into national level of the
COmbined DNA Indexing System (CODIS), each profile must be
comprised of the standard 13 core STR loci. Prior to this requirement, the
ADFS had generated a convicted offender DNA database with eight (8)
STR loci of the 13 core STR loci. With the support of the National Institute
of Justice, the Alabama Department of Forensic Sciences (ADFS) and
Marshall University Forensic Science Center (MUFSC) initiated a collaborative study to conduct additional DNA testing on these convicted
offender samples to develop results for the remaining five (5) core STR loci
and to demonstrate concordance of the STR results obtained, regardless of
the testing platform employed. The STR results submitted by MUFSC
were generated using System 1, the ABI PRISM® 3100 Genetic Analyzer,
the AmpFISTR® Identifiler® PCR Amplification Kit, ABI PRISM®
GeneScan® Software version 3.7 and Genotyper® Software version 3.7.1
(Applied Biosystems, Foster City, CA). The STR results from samples
previously processed by the Alabama Department of Forensic Sciences
were obtained using System 2, the Hitachi FMBIO® II Fluorescent
Imaging Device (Hitachi/Miraibio Genetic Systems, Alameda, CA), the
PowerPlex® 1.1 System (Promega Corporation, Madison, WI), and
FMBIO® Analysis and STaR Call ™ (Hitachi Genetic Systems). This
study demonstrates that the combination of instruments, reagents,
procedures, and analyses employed by both of these institutions provided
concordant and accurate genotyping results for databasing purposes.
* Presenting Author
Beginning in April 2002, the MUFSC submitted 5,000 STR profiles
to the ADFS using System 1 had previously been processed using System
2 by the Alabama Department of Forensic Sciences. Overall, there is
incredible concordance for all 5,000 samples between the two (2) systems.
Greater than 99.98% concordance is achieved when comparing the overlapping eight (8) loci present in both systems. Any differences noted have
been identified and summarized into the following categories: lower resolution when using System 2; stochastic amplification; and allelic dropout.
An example and respective percentages of each category will be presented.
Resolution with the capillary electrophoresis platform is much better
than resolution using slab gel electrophoresis. Further, it is known that the
amplification kits from various manufacturers incorporate dissimilar different primer sets which may result in differences in the amplification conditions and may lead to destabilization of the amplification and eventually
stochastic effects and/or allele dropout. The frequency of stochastic effects
and allele dropout is extremely low. The manufacturer of the kit with the
loci exhibiting the highest frequency of allelic dropout observed in this
study (i.e., D13S17 and D16S539) has subsequently modified PowerPlex®
kit(s) to incorporate amplification of the null alleles. Rare observations of
stochastic effects and/or allelic dropout were observed and documented at
various loci in both testing systems. The searching algorithms available
within the CODIS software which employ moderate stringency searches
and allow for a selected number of mismatches can address any low
frequency differences between testing platforms.
This concordance study demonstrates that either multiplex reagent kit
or instrument platform can be effectively used to process convicted
offender samples. The study demonstrates that the procedures employed
are robust and valid. Furthermore, this study will present recommendations
for the forensic community regarding the interpretation of DNA profiles
developed from convicted offender samples and their subsequent entry into
CODIS in order to maximize the current searching algorithm to aid in the
identification of the perpetrators of violent crimes.
Supported under Award Number 2001-RC-CX-K002 from the Office
of Justice Programs, National Institute of Justice, Department of Justice.
Points of view in this document are those of the authors and do not necessarily represent the official position of the U.S. Department of Justice.
CODIS, Concordance, Databasing
B112 “Safe in the Crosshairs”:
One-Way™ Bullet Resistant Glass
Susanna Rudy, RN, MSFS*, University of California Medical Center at
San Diego, 200 West Arbor Drive, San Diego, CA 92103
After attending this presentation, law enforcement, investigators,
ballistics specialists, and criminalists will be informed of this unique type
of glass, who produces it, how it is manufactured, how it works, the ammunition that it repels and the types of individuals and organizations that have
access to this technology and are currently using this product as well as
others offered by Labock Technologies in order to protect against terrorism
and criminal activity.
An awareness of the existence of this type of glass has a significant
impact on the way law enforcement and various other governmental
agencies may chose to outfit their personnel for security purposes. This
presentation will impact the forensic community and/or humanity by
benefitting to criminalists and ballistic specialists in solving forensically
significant cases involving such glass.
As the World focuses its attention on the sad demonstration and threat
of terrorism and increasingly more violent crimes, hopes for safety and
security lie in the skills and intelligence of science and technology. They
are the minds that work quietly behind the scenes to develop state of the art
deterrents and safety devices necessary to protect the lives of those who
speak for a greater World peace and stay one step ahead of those who
mastermind to destroy it.
* Presenting Author
Labock Technologies Inc., a research, development and manufacturing company known to many government agencies and corporations for
its armoring technologies has come to the forefront in the war on fighting
terror by introducing a revolutionary new concept in a bullet proof glass
design. One-Way™ bullet resistant glass. Labock is the only company that
has successfully produced a bullet resistant, high clarity/glass/plastic armor
system that offers protection against hostile fire while allowing successful
return fire from within the confines of the vehicle or structure without
damaging the integrity of the glass.
The glass is made of a series of polycarbonate, acrylic and glass layers
merged in a special manufacturing process. It is significantly lighter, has
lower distortion and gives up to 90% clarity. Passing all of the standard
governmental agencies ballistic tests 100% of the time, the One-Way™
protection system (unidirectional armor) is resistant up to NIJ level III
standards. This technology is offered to distinguished clients only. This
technology has been featured in several publications including Discover
Magazine, New Orleans city Council News and the History Channel. This
state of the art technology is being used as the primary source of protection
in many vehicles and buildings that are currently in the rebuilding phase of
Iraq.
Terrorism, One Way (TM) Bullet Resistant Glass, NIJ Level III
Standards
B113 Effects of Aging on Pressure Sensitive
Tape Analysis: A Preliminary Study
Rebecca Bucht, BSc*, 309 West 76th Street, #4A, New York, NY 10023
The goal of this presentation is to present preliminary results on how
accelerated aging and prolonged exposure to moderate heat affect the IR
spectra of the backing and adhesive layer of tapes, as well as microspectrophotometry of the backing.
The comparison of tapes to database information and standards often
involves the use of IR spectra of the backing and adhesive, as well as MSP
of the backing. This presentation will impact the forensic community
and/or humanity by showing the important of considering how exposure to
different environments can affect these features.
Forensic tape analysis involves either attempting to match two pieces
of tape or attempting to identify a tape by comparing it to standards in a
database. Parameters contained in the database include a number of
physical features and chemical properties.
Physical features include functions of dimensions and morphology,
which are not necessarily stable when the tape is taken off the roll and
applied. More stable and objective measurements such as determination of
the components of the backing and adhesive, as well as MSP measurement
of the color of the backing, have been proposed to add more stable dimensions to the databases. IR spectra of the backing and adhesive have been
proposed in order to identify the components of the backing and adhesive
layers. However, both the polymers and additives used in pressure sensitive tape backings and adhesives degrade when exposed to a number of
factors such as oxygen, humidity, mechanical stress, aggressive media and
ionizing radiation and temperature. This degradation has the potential of
altering the appearance of the IR and MSP spectra.
A selection of tapes was obtained, including office, duct, electrical and
packing tapes. The backing layers were analyzed by ATR-FTIR and MSP,
and the adhesive layers by DRIFTS. One set of tapes was then exposed to
moderately heat in an oven set to 55°C and another to accelerated aging
according to the ISO 4892-2 standard. T he tapes were attached to two different plastic films, PVDC and LLD-PE. Spectra of the backing and adhesives were then obtained by ATR-FTRI and DRIFTS and compared to
those of the unexposed tape.
The main polymer component of the spectra did not change significantly, but noteworthy changes were observed in smaller peaks that could
be used to differentiate between tapes of the same base polymer but
87
different manufacturers. As expected, not all types or brands of tapes
reacted similarly to the environmental exposure. In addition, some changes
in the adhesive spectra appear to be influenced by the substrate the tape was
deposited on during its exposure to heat or weathering. Only one set of
tapes was exposed to each of the environments, and only one set of
analyses performed on each sample, so the results would have to be
confirmed by a more comprehensive study.
More work needs to be done to validate and further define these
results, but it seems clear that effects from exposure to different environments, and potentially substrate effects should be taken into consideration
when analyzing pressure sensitive tapes.
Pressure Sensitive Tape, IR, Database
B114 A Comprehensive Training and Professional
Development Program for an Accredited
Forensic Laboratory in the Public Sector
Gareth P. Jones, MSc, and Kimberley A. Johnston, MSc, BA*, Centre of
Forensic Sciences, 25 Grosvenor Street, 2nd Floor, Toronto, Ontario M7A
2G8, Canada
The goal of this presentation is to provide a laboratory seeking
American Society of Crime Laboratory Directors/Laboratory Accreditation
Board (ASCLD/LAB) accreditation with guidance and a framework for
implementing a successful Training and Professional Development
program.
humanity by providing a model that can assist an organization in creating a
training and professional development program and policy that meets or
exceeds ASCLD/LAB requirements and is considered by all staff as an
integral component in their employment.
This presentation will describe the design of a comprehensive training
and professional development program suitable for an ASCLD/LAB
accredited forensic laboratory in the public sector.
The relevant ASCLD/LAB principle, standards and criteria are:
•
1.3.3 TRAINING AND DEVELOPMENT PRINCIPLE
Training and development of employees must be emphasized to
improve accuracy, increase productivity, and enable them to
assume greater responsibility.
•
STANDARDS AND CRITERIA
A training program to develop the technical skills of employees
is essential in each applicable functional area.
•
1.3.3.1 Does the laboratory have and use a documented training
program in each functional area for employees who are new,
untrained or in need of remedial training? (E)
•
A formalized personnel development program is important to
prepare employees to assume more responsible jobs.
•
1.3.3.2 Does the laboratory have an employee development
program? (I)
The Centre of Forensic Sciences (CFS) Training Manager is
accountable for ensuring that high-quality, relevant training and education
services are made accessible and provided to staff on a regular basis.
This work is facilitated through a Training and Education Committee,
which consists of a manager from each section/unit (total 11) and is responsible for providing the Training Manager with:
•
Assistance, advice and support in the development of CFS-wide
training initiatives.
•
Staff and resources for the delivery of CFS-wide training
initiatives.
•
Assistance, advice and support in the development of an annual
training plan of external educational commitments.
•
Staff and resources for the delivery of all external educational
commitments.
•
The development and implementation of internal training
program(s) specific to each section/unit.
88
•
The training and development plans for each member of their
staff.
•
Assistance in the development and maintenance of a process for
the allocation of funds for specific and general training
initiatives.
•
A forum for representatives from each CFS section/unit to
discuss general and specific training needs.
The Training Unit is responsible for implementation of committee
resolutions and decisions.
The training and professional development program at the CFS, which
meets ASCLD/LAB requirements, is detailed in the lab’s Training and
Professional Development policy. Opportunities for training and development are provided to all CFS staff (operational/administrative support
staff, technologists, scientists, and managers). The training and development program for all staff commences with the offer of employment,
when each new staff member receives an outline of his/her training and
development program for the first year.
Additionally, each staff member, in conjunction with her/his manager,
develops an annual performance and development plan that includes
training and development opportunities identified during each individual’s
performance review.
The manager responsible for training and development in each
section/unit compiles the individual learning plans into a section/unit plan
and submits it to the CFS Training Manager for organizational integration
and implementation within the funding envelope of the Centre’s annual
training budget, which is sheltered from erosion. Dispensation of training
funds is influenced by many factors including the size of each section/unit,
available operational and developmental opportunities, and organizational
pressures.
The CFS training and professional development budget’s funding is
approximately 4 to 6% of the Centre’s salary budget. This level of funding
is aligned to the benchmark established by both the Government’s Human
Resource Strategy – which outlines that high performance and high technology organizations provide approximately 6% of their salary budget for
training – and the American Society of Training and Development’s annual
reports of funding levels for leading edge organizations (Training
Investment Leaders).
New staff complete an orientation program that provides health and
safety training, information on the role of the CFS in support of the justice
system and public safety, access to Human Resources information and an
introductory tour of the facility.
Basic training for new staff, in addition to the orientation program,
consists of organization-wide and section/unit-specific programs that differ
depending on the section/unit and the nature of the individual’s job.
Organization-wide training includes some or all of the following elements:
Policy training; Quality Assurance, Training, and Library information sessions; Miscarriages of justice training; Court system training; Centre
Receiving Office training; and autopsy attendance. Section/unit specific
training includes practical and theoretical components and a variety of
competency tests.
Professional development is based on individual learning plans and
often includes consideration of the technical and behavioral competencies
identified for the individual’s job, as well as section/unit, organizational,
Ministry and Ontario Public Service needs and requirements.
Generally, professional development opportunities include: attendance at seminars and courses; attendance at administrative, professional,
scientific, or management conferences; membership on inter- or intra-ministry work projects/committees; membership on scientific/technical
working groups; cross-assignments or re-assignments; and secondments.
In addition, professional development may include behavioral competency
assessment in alignment with the Ontario Public Service competency
models developed for scientists, technologists and managers at the Centre.
Staff may also be provided with opportunities to deliver client education as
part of their development program.
Training, Professional Development, Accreditation
* Presenting Author
B115 Potential for Brand Name Identification
by Tomato Seed DNA Typing
B116 Progress in the Individualization
of Gasoline Residues
Cheng-Lung Lee, MFS*, Nuclear Science Department, National Tsing
Hua University and Hsinchu Municipal Police Bureau, 101, Section 2,
Kuang Fu Road, Hsinchu, 300, Taiwan, Republic of China; Heather
Miller Coyle, PhD, 278 Colony Street, Meriden, CT 06451; Ian C.
Hsu, PhD, Kuang Fu Road, Hsin Chu, 101 Sec 2, Taiwan, Republic of
China; and Albert Hooper, PhD, Carol Scherczin, PhD, Timothy M.
Palmbach, PhD, Henry C. Lee, PhD, and Albert B. Harper, PhD, JD,
Institute for Forensic Science, 300 Orange Avenue, West Haven,
CT 06516
J. Graham Rankin, PhD*, Jeremy Wintz, MSFS, and Raymond Everett,
BS, Marshall University, Forensic Science Program, 1401 Forensic
Science Drive, Huntington, WV 25701
In recent years, DNA has been successfully extracted and analyzed
from a variety of plant materials including seed pods, leaves and other
vegetative matter from plant species such as Cannabis sativa (marijuana)
and other ornamentals (Palo verde, Sutera). The ultimate goal of plant
DNA typing is to extend the microscopic analysis of vegetative trace materials to further classify or individualize the sample. Since seeds are small,
often adherent to clothing, and edible (stomach contents), they are a good
choice to optimize for DNA typing from crime scene evidence. As a model
system, the authors are using the amplified fragment length polymorphism
(AFLP) method for DNA individualization of Lycopersicum esculentum
(tomato) seeds that are common to many cuisines around the world.
The results indicate that high quality DNA could be extracted from
fresh tomato seeds after they passed through the human digestive system
using a commercially available plant DNA extraction kit. Although the
sample weight was significantly less than the recommended amount for the
kit, high quality and sufficient quantity of DNA was isolated from a single
tomato seed to generate an AFLP profile. When DNA profiles were
compared from different seeds, several variety-specific markers (DNA
fragments) were identified. Although the sample size was small (n = 4
seeds each per 5 different tomato varieties), these markers look promising
for tomato variety identification. Additional screening of larger tomato
populations is in progress. Not only will new markers be identified and
correlated with a tomato variety, but the percentages of shared markers can
be estimated by comparisons of samples from the same variety and
between varieties. A brief description of tomato varieties and their cultivation history will be provided in this presentation. Tomatoes have been
extensively cultivated and many share a common genetic ancestry and so
have been notoriously difficult to distinguish genetically due to high levels
of inbreeding. The AFLP technology has been specifically developed to
generate high marker saturation across plant genomes to overcome the
inbreeding issue.
In addition, a comparison of fresh and processed tomato seeds and the
subsequent recovery of DNA were performed. Fresh tomato seeds, both
digested and undigested yielded an average of 62.5 ng/ 50 uL of DNA per
seed embryo. Interestingly, DNA was not recoverable from processed
tomato seeds from spaghetti sauces or canned tomatoes presumably due to
the pressure and heat treatment during processing. Further studies are in
progress to define if other forms of cooking (e.g., oven baking, boiling etc.)
affect the ability to recover PCR quality DNA from tomato seeds. In
summary, the data demonstrate that AFLP analysis is appropriate for individualization of unprocessed tomato seeds and may be useful for linkage of
stomach contents back to a location, especially once variety-specific
markers have been determined.
Forensic Botany, Plant DNA, Tomato Seed
After attending this presentation, attendees will have a better understanding of the methodology of gasoline individualization, the problems
associated with comparing neat gasoline samples with residues from fire
debris and the use of multivariate statistical methods in making those
comparisons.
humanity by providing better methods for individualizing gasoline residues
in suspected arson cases.
Gasoline is a frequent accelerant used by arsonists. Identification of
gasoline in fire debris is relatively easy even when greatly evaporated.
However, when a suspect is apprehended with gasoline residue on his
clothes or a gasoline can in his vehicle, the question arises if the gasoline
residue from the fire debris can be matched with that found with the
suspect. This has proven to be a more difficult challenge. Further recent
legal challenges to comparison evidence have stressed the necessity of
establishing a statistical probability for that match.
Julia Dolan (ATF National Research Lab, Ammendale, MD), at the
2002 meeting of AAFS, presented a high-resolution GCMS method for
comparing gasolines based on 20 sequential area ratios of 34 target compounds from 3-methylpentane through the 1-methylnaphthalene. Her data
set included 36 different gasolines, including both regular and premium,
mostly from around the Washington, DC area. In addition to neat gasolines, 25% and 50% evaporated samples were analyzed. Mark Sandercock
(RCMP, Edmonton, AB, Canada) has developed an alternative method for
gasoline individualization based on two and three ring polyaromatic hydrocarbons that he was able to differentiate even at 90% evaporation. Neither
study involved simulated fire debris.
As part of an ongoing study, the authors have assembled a collection
of over 100 gasoline samples from across the U.S. and have analyzed many
of these by both the Dolan and Sandercock methods. In addition, analyses
of simulated fire debris (charred wood and carpet pad) comparing the
gasoline residues with their corresponding neat gasoline will be presented.
The ASTM method E1412 (activated charcoal strip adsorption, ACS) is
typically used in fire debris analysis but discrimination effects have been
reported in the past. Effects of the ACS method on comparison of gasolines
by both methods will also be presented.
Gasoline Individualization, Fire Debris Analysis, Principal
Components Analysis
B117 Adsorption Saturation and
Chromatographic Distortion Effects
on Passive Headspace Sampling With
Activated Charcoal in Fire Debris Analysis
Mary R. Williams, BS, Denise Fernandes, BS, Candice Bridge, BS, Derek
Dorrien, Stefanie Elliott, and Michael E. Sigman, PhD*, National Center
for Forensic Science, University of Central Florida, P.O. Box 162367,
Orlando, FL 32816
Attendees will emerge from the talk with an appreciation for the complicating effects of adsorbent saturation on the resulting chromatographic
profile in ignitable liquid analysis. Audience members will be provided
with an understanding of the causes of chromatographic distortion and
ways to alleviate these effects in arson investigations.
* Presenting Author
89
humanity by presenting results which will be discussed along with their
relevance to ASTM methods and possible impacts on the analysis of
ignitable liquids residues for pattern matching and source identification.
The recovery of hydrocarbons from an equimolar test mixture containing C7 – C10 components has been investigated to determine the
influence of hydrocarbon vapor phase concentration on the molar quantities
and ratios of the components recovered by passive headspace sampling with
activated charcoal. In a one-quart container, hydrocarbon volumes as small
as 24 µl (liquid) were sufficient to saturate a 99 mm2 activated charcoal
square. Hydrocarbon displacement from the saturated surface of the activated charcoal resulted in significant distortion in the molar ratio and chromatographic profile of the recovered hydrocarbons. Hydrocarbon
adsorption data for the C7 – C10 equimolar mixture was used to estimate the
average surface area of the activated carbon at 1128 ± 197 m2/g. In order to
demonstrate the effect of adsorbent saturation on a commonly encountered
commercial accelerant, similar experiments were performed with gasoline.
Passive headspace sampling of similarly small volumes of unweathered
gasoline resulted in significant distortion of the chromatographic profile of
the components recovered from the headspace by passive sampling. The
chromatographic profile of the recovered hydrocarbons closely resembled
75% weathered gasoline. A method of subsample collection and analysis
was demonstrated as a way to alleviate distortion from samples containing
heavy loadings of ignitable liquids. Carpet and carpet padding were placed
in a quart container and a heavy loading of unweathered gasoline was placed
in the center of the carpet and padding. The container was closed and heated
to 60ºC for a period of 16 hours to bring the volatile components from the
gasoline into the vapor phase. The container was then cooled to room temperature and a subsample of the carpet padding was removed and placed into
an empty one-quart container along with a 99 mm2 activated charcoal strip.
The subsample was heated to 60ºC for a period of 16 hours and the activated
carbon was subsequently extracted with CS2 and analyzed by GC/MS. The
resulting chromatogram closely resembled the chromatographic profile of
the unweathered gasoline.
These results will be discussed along with their relevance to ASTM
methods and possible impacts on the analysis of ignitable liquids residues
for pattern matching and source identification.
Fire Depris, Ignitable Liquids, Trace Evidence
B118 Application of a Standardized Gas
Chromatography Tandem Mass
Spectrometry Method for the Improved
Detection of Ignitable Liquid Residues
Jeannette M. Perr, BS*, Kenneth G. Furton, PhD, Marilyn Prieto, and
José R. Almirall, PhD, Florida International University, International
Forensic Research Institute, Department of Chemistry and Biochemistry,
11200 Southwest 8th Street, CP 316, Miami, FL 33199
The goal of this presentation is to decribe an approach to improve the
detection and identification of ignitable liquid residues (ILR) through development of a standardized gas chromatography ion trap tandem mass spectrometry (GC/IT/MS/MS) method that is simple to implement and interpret.
humanity by describing an approach to improve the detection and identification of ignitable liquid residues through development of a standard
GC/IT/MS/MS method that is simple to implement and interpret. Data in
support of the method will be provided and the advantages of the method
will be shown through examples where GC/MS analysis alone does not
provide conclusive results. This method allows for improved analysis of
ILR evidence by overcoming previous disadvantages of MS/MS methods
without increased examiner labor or time or the need for complicated interpretation software.
90
The detection and identification of small quantities of ignitable liquid
residues in fire debris evidence can be difficult due to: significant alteration
of these mixtures during the fire, recovery methods that afford poor selectivity and/or sensitivity, and co-extraction of interfering products (IP). The
objective of this project was the development of a standardized
GC/IT/MS/MS method that can be employed on an ion trap mass spectrometer, independent of manufacturer. Flexible chromatographic parameters and uniform ionization parameters were incorporated in the creation
of a standardized GC/MS/MS method for ILR analysis.
Regions of uniform ionization, termed bins, were created using the
standard n-alkanes, C8 through C23, as markers. The general approach
described in this presentation can be used in any GC/IT/MS/MS instrument
and the spectra generated can be shared as a guide between instruments. An
examiner can generate his/her library for use in their laboratory or use a
previously created IT/MS/MS library due to the uniform ionization.
Changes in chromatographic parameters would require minor adjustments
of the bins. A searchable mass spectral database produced from this
method would facilitate identification of components found in ignitable
liquids (ILs) and interfering products (IPs). Chromatograms obtained using
the standard IT/MS/MS method will be presented and compared to data
generated by typical MS methods for different ILs and their corresponding
weathered fractions in the presence of interfering products. Data in support
of the advantages of the method will be shown through examples where
GC/MS analysis alone does not provide conclusive results.
These experiments will improve current analysis of fire debris without
significantly changing the workload of the examiner or the time required
for analysis. It is anticipated that the results using GC/IT/MS/MS will not
require sophisticated training or data analysis programs. This method is
expected to allow for the identification of ILRs that might currently go
undetected.
Ignitable Liquid Residues, Interfering Products, GC/IT/MS/MS
B119 Fire Debris Analysis Using GC/MS/MS:
Detailed Case Study Interpretations
Dale A. Sutherland, BSc, CChem*, Activation Laboratories, Ltd., 1336
Sandhill Drive, Ancaster, Ontario L9G 4V5, Canada
Attendees will gain a better appreciation and measure of the increase
in specificity gained through the use of the GC/MS/MS method, how it is
used, and the benefits of potentially using this method in their practice. The
conferee will also gain an insight into recent research published on the use
of GC/MS/MS on fire debris.
humanity by providing forensic scientists with a mean to better evaluate
and consider the importance of the use of GC/MS/MS for the analysis of
ignitable liquids in fire debris. These scientists are being asked to vote on
the publication of this method as an ASTM guideline and it will afford them
the chance to interact and see detailed results from the use of this method
as explained by one of the most experienced forensic scientist in the use of
this technique. Scientists in this field will then further understand it’s
capabilities as a more specific analysis with an associated higher level of
confidence in the result and how it applies to presentation in the courtroom.
Through ASTM publication this method will reduce the occurance of false
negative results and allow this forensic field to keep abreast with the current
level of science.
The use of GC/MS/MS in the analysis of fire debris is being proposed
by an ASTM sub-committee of the Criminalistics section. A guideline has
been written, reviewed, revised and is now pending appropriate voting by
members. This instrumentation and use of GC/MS/MS is well proven and
has been used in other fields of testing such as Environmental,
Pharmaceutical and the Drug Testing field for several years. The analysis
of fire debris using GC/MS/MS itself has now been published in journals
* Presenting Author
for over seven years. The use of a second coupled mass spectrometer based
segment significantly improves the selectivity of the analysis and is the
instrument of choice when presented with the objectives to detect and
identify trace contaminants within highly complex matrices. The analysis
for ignitable liquids in fire debris fits this situation and GC/MS/MS is the
instrument of ultimate choice for such mixture analysis. The advent of
GC/MS in this field, through today’s wide use of ASTM E-1618
represented a significant step forward in the reliability of the analysis of fire
debris. However, when these samples are highly weathered or contain
possible trace quantities of an ignitable liquid in a particularly complex
debris sample, GC/MS may not yield confident court presentable results or
may not illustrate to the scientist enough ignitable liquid characteristics to
determine a confident positive identification. In such circumstances the
scientist may often suspect the presence of an ignitable liquid but without
sufficient presentable characteristics the result may be undetermined. The
use of GC/MS/MS may often more clearly illustrate the required characteristics for the identification of an ignitable liquid when present and thus
potentially avoid the reporting of a false negative determination. This
method can provide profiles of superior comparability to reference
ignitable liquid analyses than with GC/MS as the effects of pyrolysates on
the profiles of various compound class characteristics of ignitable liquids
can be vastly reduced. The aspect of presentability is becoming more
important for the courtroom so that the judge and members of the jury can
clearly conclude similarity of the results of fire debris analysis to reference
ignitable liquids and thus have more confidence in the result and better
information to make their conclusions. The use of GC/MS/MS has already
been presented in court specifically for the analysis of fire debris samples.
This presentation will focus on the step-by-step interpretation, using a
class pattern recognition approach, of two samples from different case
studies that will illustrate the specific advantages and limitations of the
analysis of fire debris using GC/MS/MS versus the GC/MS method outlined in ASTM E-1618. The presentation will also address previous concerns of sensitivity with reference to the abilities of the trained K9 often
used to locate samples at the scene.
Analysis, GC/MS/MS, Debris
B120 Transfer and Adherence of Gasoline Vapors
Onto Clothing in an Enclosed Room
Raymond J. Kuk, MS*, Bureau of Alcohol, Tobacco, Firearms, and
Explosives, Forensic Science Laboratory, Washington, 6000 Ammendale
Road, Ammendale, MD 20705; and Edward C. Diamond, BS, Bureau of
Alcohol, Tobacco, Firearms, and Explosives, Ann Arbor, MI Field Office,
Ann Arbor, MI 48104
The goal of this presentation is to provide information regarding the
exposure of clothing to gasoline vapors in an enclosed room and the
subsequent laboratory testing of the clothing.
Chemists who analyze fire debris are sometimes requested to examine
a suspect’s clothing for the presence of ignitable liquids. The presence or
absence of ignitable liquids on a suspect’s clothing may play a significant
role in a trial. Several factors may have an effect on the retention of
ignitable liquids and or vapors on the clothing. These factors include
whether or not liquid was spilled on the clothing, duration of exposure and
the time between exposure and collection of the clothing.
This study was conducted as part of the ATF certification program for
certified fire investigators and examined the transfer and adherence of
gasoline vapors to various clothing materials and the effect of time between
exposure and collection. The clothing items used in this study were
swatches from a pair of 100% cotton jeans, a 100% cotton t-shirt, a 100%
polyester t-shirt, and a 50:50 cotton:polyester sweatshirt. In order to simulate a standard room, a 1:12 scale model of a 10-foot by 12-foot room was
constructed using plywood, drywall and pressboard flooring. No doors or
windows were cut into the walls in order to minimize the escape of vapors.
* Presenting Author
The interior of the room was not finished in order to minimize the available
material on to which the gasoline vapors could adhere. These factors were
selected to simulate a worst-case scenario for an enclosed room. Four
rooms were constructed - one for each type of fabric. A metal baking pan
was placed on the floor of each model to contain the liquid gasoline.
Fishing wire and binder clips were used to suspend five three-inch square
swatches of each fabric material approximately three inches above the
metal pan.
It was assumed that one-half gallon of gasoline would be a sufficient
amount to pour around a 10-foot by 12-foot room. This volume of gasoline
was reduced by a factor of 12 and poured into the metal pan. A drywall
ceiling was put into place and the room was enclosed for a period of 15
minutes. After 15 minutes, the ceiling was displaced and the fabric
swatches were removed. One swatch was immediately placed into a quart
can, and the can was sealed. The remaining swatches were exposed to
atmospheric conditions for 15 minutes, 30 minutes, 60 minutes, and 24
hours. After each time frame, one fabric swatch was placed in a quart can
and the can was sealed. This process was repeated twice more with fresh
gasoline for each trial. A control sample of each fabric was also collected.
Each fabric sample was extracted using passive headspace concentration with a charcoal strip (ASTM E-1412). Each sample was heated at
65°C for 16 hours and extracted with 150 µL of carbon disulfide. The
samples were then analyzed using a gas chromatograph – mass spectrometer. The total ion chromatogram and the aromatic (m/z = 91 + 105 +
119 + 133) extracted ion profile were used to evaluate the data.
All of the control samples were negative for the presence of gasoline.
Each fabric sample packaged immediately after exposure showed
indications of gasoline in both the total ion chromatogram and the extracted
aromatic profile, but the patterns were not significant enough to warrant a
positive identification of gasoline. After 15 minutes of atmospheric
exposure, only the polyester t-shirt and the sweatshirt showed indications
of gasoline in the aromatic extracted profile. After 30 minutes of
atmospheric exposure, none of the samples showed any indications of
gasoline.
This test was repeated with 20 µL gasoline placed on each of the
fabric swatches to simulate approximately 12 drops of gasoline spilled on
each fabric sample. Positive identification of gasoline (evaporated) on each
of the fabric materials could be made on the samples immediately packaged
and after 15 minutes of atmospheric exposure. After 30 minutes, gasoline
(evaporated) could be identified on the jeans, the cotton t-shirt, and the
sweatshirt. After 60 minutes gasoline (evaporated) could be identified only
on the jeans.
This study demonstrates that in an enclosed room the volatile components of gasoline may adhere to various types of clothing material.
However, a positive identification of gasoline by the laboratory would be
unlikely even if the clothing was packaged immediately after the exposure.
After being exposed to the environment for a short period of time, any
indications of gasoline are eliminated. However, when liquid gasoline
comes in contact with clothing, the laboratory can make a positive identification of gasoline if the clothing is collected a short period of time after the
exposure.
Gasoline, Clothing, Ignitable Liquid
B121 High Speed High Resolution
GC/MS of High Explosives
Chin-Chin Lim, MSc, MBA*, Poh Ling Chia, BSc, Sok Hwee Irene Tan,
Kim Lian Janice Kuah, MSc, and Ming-Kiong Michael Tay, PhD, MBA,
Centre for Forensic Science, 11 Outram Road, Singapore, 169078,
Singapore
Attendees will learn the use of high speed GC/MS to perform rapid,
efficient, and reliable analysis and identification of trace levels of high
explosives in post-blast debris.
91
High speed high resolution GC/MS has the potential to be a powerful
tool in routine analysis by increasing sample throughput and improving
laboratopry productuivity. Significant savings in time and money can be
acheived through this technique without sacrficing sepration efficiency.
providing useful for the fast analysis of organic explosive mixtures in postblast investigation where a short “time-to-result” is urgently required.
Introduction: The rapid, sensitive, and specific identification of trace
levels of high explosives has taken center stage with the escalating threat of
terrorist acts worldwide. High speed high resolution GC/MS has the
potential to be a powerful tool in explosive analysis by increasing sample
throughput (save time and money) and improving laboratory productivity.
This paper focuses on a faster separation of a mixture of 14 organic
explosives with improved resolution compared to the conventional method.
It explores the scope and limitations of the speeding approaches for the
analysis of high explosives. The objective is to demonstrate that rapid
analyses are possible and can be achieved without sacrificing resolution
and separation efficiency.
Three columns were used in this study: the conventional long middle
bore column (30 m x 0.25 mm x 0.25 µm), a short middle bore column
(10 m x 0.25 mm x 0.25 µm), and a short narrow bore column (10 m x 0.1
mm x 0.1 µm). Different speeding approaches were adopted and each of
their significance and impact in reducing the analysis time was evaluated
by comparing the column efficiency, peak resolution, areas, heights, and
widths. The speeding approaches used include:
(a)
(b)
(c)
(d)
(e)
Fast temperature programming
Higher initial oven temperature
Increased carrier gas velocities
Pressure programming
Decreased length, bore size, and film thickness of columns
The effects of a temperature programmed injection temperature on
peak broadening and sample decomposition were also investigated using a
programmable temperature vaporiser (PTV). Peak resolution, areas,
heights, and widths obtained under PTV conditions were compared to those
performed using various constant injection temperatures.
Materials and Methods:
Instrumentation
The analyses were carried out using a GC/MS with programmable
temperature vaporiser (PTV). Three columns were used:
(a) HP-5MS (30 m x 0.25 mm x 0.25 µm)
(b) PTE-5MS (10 m x 0.25 mm x 0.25 µm)
(c) DB-5 (10 m x 0.1 mm x 0.1 µm)
The analytes were injected into the PTV at isothermal temperature and
with temperature programming, using different ramp rates.
Analytes: The explosive mixture used in this study comprises of a 70
ppm solution of nitroglycerin (NG), ethylene glycol dinitrate (EGDN),
2-nitrotoluene, 3-nitrotoluene, 4-nitrotoluene, 2,4-dinitrotoluene, 2,6-dinitrotoluene, 2,4,6-trinitrotoluene (TNT), 4-amino-2,6-dinitrotoluene,
2-amino-4,6-dinitrotoluene, nitrobenzene, 1,3-dinitrobenzene, 1,3,5-trinitrobenzene, and cyclotrimethylene trinitramine (RDX).
Results and Discussion:
Characteristics of analytes
The 14-component explosive mixture comprises of analytes which are
thermally labile (requiring low injection temperature) and those which are
non-volatile with high boiling points (requiring high injection
temperatures).
Conventional GC/MS
Conventional GC/MS for the analysis of high explosives is performed
using a long middle bore DB-5MS column (30m x0.25mm x 0.25 µm) at
an injector temperature of 150°C and oven temperature of 50 to 200°C at
15°C/min. The analysis time is 14.8 minutes. The objective of this study
is to apply various speeding approaches to reduce this long analysis time to
achieve a short “time-to-result” analysis.
92
High speed GC/MS
(a) Injection system
Sample introduction is the most critical step in high speed GC
because it affects band broadening. The advantage of a PTV is
that it combines a cool injection step with controlled
vaporisation. The smaller i.d. liner of the PTV can also be
heated or cooled more rapidly and this helps to reduce peak
broadening.
There was poor sensitivity of the high boiling point analytes at
an isothermal injection temperature of 100°C while thermally
labile components decomposed at higher temperatures. On using
a PTV temperature program from 100 to 250°C, the decomposition of the thermally labile analytes was greatly reduced and
better detection limits of the higher boilers were obtained.
The ramp rate for the PTV was investigated at the various temperature programming rates from 50°C/min to 250°C/min. At
low ramp rates, resolution was poor for two critical pairs. There
was a marked improvement in peak separation, peak shape, area,
and height at higher ramp rates. Hence, PTV was employed in
all the analysis with the three columns.
(b) Long middle bore column (30 m x 0.25 mm x 0.25 µm)
It was observed that only the initial oven temperature has some
impact on reducing analysis time but overall results of the other
speeding approaches are relatively insignificant with some loss
of resolution. Although increasing the ramp rate produced significant changes in analysis time, peak separation was poor and
hence, faster temperature programming rates could not be implemented in this analysis.
(c) Short middle bore column (10 m x 0.25 mm x 0.25 µm)
An effective way to reduce analysis time is to reduce the column
length. Increasing the ramping rate from the conventional
15°C/min to 70°C/min produced the most significant change in
analysis time with good resolution. Combining all the speeding
approaches resulted in a significant reduction in analysis time by
80%.
(d) Short narrow bore column (10 m x 0.1 mm x 0.1µm)
Narrow bore columns with thin films are more efficient and have
better resolution. It is also possible to work at higher linear gas
velocities with less loss in efficiency. Increasing the ramping
rate from the conventional 15°C/min to 70°C/min produces very
significant changes in analysis time. The shortening of column
length, constant pressure programming and higher initial oven
temperature produced marginal reductions in analysis.
Combining all the speeding approaches resulted in a significant
reduction in analysis time by 80%.
Comparison of the three columns
(a) Analysis time
There was a significant 4.5 fold reduction in analysis time for
both the short middle and short narrow bore columns but a
marginal 1.5 fold reduction was obtained for the long middle
bore column.
(b) Column efficiency
Plate height was used as a measure of the efficiency of the
columns. Plate heights obtained for the 3 columns were similar.
(c) Peak width and resolution
The peak widths were similar for the two short columns, which
were only ½ the width of the peaks obtained for the long middle
bore column. The resolution-calculations were carried out using
the two critical pairs. The two short columns gave good
resolution for the two peak pairs and a baseline separation of
these pairs was obtained. The data indicate that the gain in speed
was achieved without sacrificing resolution.
(d) Repeatability
There is usually a concern that high speed GC will produce peaks
that are not ideal in shape with the presence of fronting and
tailing, poor baseline resolution or poor precision of the retention
* Presenting Author
times and peak areas and heights with faster temperature
programming. To determine the precision of the high speed GC
method, six repeated injections of the explosive standard mixture
were performed. From the results obtained, the repeatability of
the retention times, peak areas, and heights in high-speed
analyses were found to be satisfactory.%RSD of these
parameters for the columns were found to be similar to each
other.
(e) Limits of detection (LODs)
Better LODs were observed for the narrow bore column. This is
probably due to the increased signal to noise ratio for the much
narrower peaks.
(f) Limiting factors
The use of high speed GC is usually hindered by a lack of
instrumentation. A high power GC oven is required to allow for
high programming rates up to 100°C/min. Pressure can also
become a limiting factor for a number of speeding approaches.
The use of shorter columns is limited by the minimum inlet
pressure required for stable operation of the carrier gas system
while long narrow bore columns require sufficiently high
pressures. The use of columns with a reduced i.d. is one of the
most logical approach for high speed GC but sample capacity
has to be compromised. Sample capacity of a column with small
i.d.s is lower than that of a middle bore column.
Sample matrix
Sixteen different materials were swabbed with acetone and the swabs
were concentrated and analysed using the narrow bore column. The materials tested include: metals, plastics, paper, polymeric materials, wool, soil,
sand, tape, and rubber. Only two materials gave co-eluting interference
with two of the analytes. A plastic container had a co-eluting peak with
TNT and the chromatographic profile of newspaper had a peak that coeluted with EGDN.
Conclusion: This new technique allows the Criminalistics Laboratory
to perform rapid, efficient, and reliable identification of trace levels of
organic explosive residues in post-blast exhibits without sacrificing resolution and separation efficiency. There is a significant decrease in analysis
time by 4.5 fold (from 14.8 minutes to 3.3 minutes) Fast temperature programming rates significantly decreased the analysis time, much more than
other speeding approaches. Compared to conventional GC techniques, a
significantly higher sample throughput is now possible. The new approach
has the additional advantages of lower limits of detection, better peak separation, and resolution and a reduction in thermal degradation.
High Speed GC/MS, Programmable Temperature Vaporiser, Fast
Temperature Ramping
B122 Realizing the Science Behind
Canine Detection of Explosives
Ross J. Harper, MSc*, José R. Almirall, PhD, Douglas Heller, PhD, and
Kenneth G. Furton, PhD, International Forensic Research Institute,
Florida International University, Department of Chemistry and
Biochemistry, Miami, FL 33199
Attendees will learn scientifically sound methods and applications of
canine detection of explosives, an understanding of the ability and limitations of canine detection, and the future of this recognised method of explosives detection.
humanity by allowing members of the forensic community who are not
familiar with canine detection to become familiar with the abilities and limitations of explosives detection canines, whilst at the same time providing
specific scientific suggestions to those in the field who wish to improve
upon training and operating practices.
* Presenting Author
Police and private agencies have used canines for many years now, to
locate items of forensic interest such as explosives, controlled substances,
currency, ignitable liquid residue, hidden or missing persons, and human
remains. Up until recently however, this practice has remained more of an
art than a true science, and with the increasingly strict standards of forensic
evidence admissibility, including Frye and Daubert, validation of canine
detection, to provide peer reviewed acceptance of scientifically sound
practices, is becoming urgently required. Although viewed as older technology, now competing with microchip laboratories and micro sensors, the
canine must still be considered one of the best real-time methods for the
detection and location of explosives.
Solid Phase Microextraction has been combined with Gas
Chromatography - Mass Spectrometry (SPME-GC-MS) and Gas
Chromatography - Electron Capture Detection (SPME-GC-ECD) to
analyse the headspace of samples of explosive obtained from local and state
law enforcement agencies. The SPME-GC-ECD method used in this study
is also being optimised for potential field application. A rapid SPME
exposure followed by a 15 minute GC program provides ECD spectra of all
EPA 8330 explosives, in addition to EGDN, NG, PETN and DMNB. A
dual column method is under investigation for confirmatory analysis.
Samples analysed include cast explosives, plastic explosives,
detonation cords, powder explosives, and commercially available nonexplosives training aids. Results of analysis indicate highly similar odor
signatures within the cast and the plastic explosive groups. The cast explosives feature predominantly 2,4-dinitrotoluene and other aromatic mono-,
di- and tri-nitrates, whereas the 2,3-dimethyl-dinitrobutane taggant and 2ethyl-1-hexanol plasticiser are common in the plastic explosives. Unlike
the high explosives, the odor signatures of the powder explosives are not
similar within the group, with the odor chemicals highly dependent upon
the manufacturer’s choice, with no common chemical observed within all
samples. Chemicals detected within the powder explosive headspace
include dinitrotoluenes, ethyl centralite, diphenylamine, nitrodiphenylamine and nitroglycerin. The non-explosive training aids have been
analysed in the same manner as the explosive samples, and whilst TNT,
RDX and PETN were detected at low levels in the headspace of the silica
powder based products, the petrolatum jelly aids do not have significant
odor headspaces, above the petrochemical background matrix.
Fieldwork with local and state police agencies is currently a multifaceted project. The effectiveness of commercially available training aids
has been studied using canines previously trained using actual explosive
material, in addition to use as a training medium for new canines. It has
been observed that dogs trained on actual explosive have difficulty in
locating the non-explosive counterparts, but that dogs trained on the inert
aids have little problem in crossing over to the real explosives. Fieldwork
is also ongoing with the odor chemicals detected in the headspace of the
explosive samples. To date, 2,4-dinitrotolene and 2-ethyl-1-hexanol have
been identified as active odors for cast/powder and plastic explosive
respectively. The 2,3-dimethyl-dinitrobutane taggant is not utilised by the
canines, and is classed as an inactive odor, along with diphenylamine and
ethyl centralite, all of which the canines show little or no interest towards.
Further research has focussed upon the permeability of explosive
odors through assorted plastic and polymer containers. By varying the
thickness and chemistry of the polymer, the rate of odor permeation may be
controlled. In-house training aids have been developed utilising the active
odors and the permeation study, and these aids are currently in applicability
trials with selected law enforcement agencies. Work continues to identify
the active odors of explosive samples, and to present figures on the reliability of local and state agency trained canines when presented with hidden
explosives. Development of inert training aids that mimic explosive odor
is ongoing, and these aids have been designed to release odor at a controlled
rate of permeation, giving the ability to ‘calibrate’ the canines and calculate
minimum detection levels. It can be shown, with the data on reliability, and
minimum detection levels, that canine detection may be considered a scientifically sound method of detection.
Canine Detection, Explosives, Solid Phase Microextraction
93
B123 Raman Microscopy of Low Explosives
and Their Combustion Products
Ming-Kiong Michael Tay, PhD, MBA*, Chin-Chin Lim, MSc, MBA*, Poh
Ling Chia, BSc, Yuen San Vicky Chow, MSc, and Wanjing Su, Centre for
Forensic Science, Health Sciences Authority, 11 Outram Road, Singapore,
169078, Singapore
After attending this presentation, attendees will learn the use of
Raman microspectrophotometry on trace level detection of common ingredients of low explosives and their combustion products
humanity by illustrating the usefulness of Raman for trace level detection
of low explosives and their combustion prioducts with minimal sample
preparation.
Background: Inorganic low explosives usually consist of oxidiserfuel mixtures. They can be made using ordinary laboratory chemicals,
ammonium nitrate fertilizer, black powder, and pyrotechnic materials from
sparklers, flash powders, and fireworks. Formulations and recipes are
readily available on the Internet. Common oxidising agents used are
nitrates, perchlorates, and chlorates of sodium, potassium, and ammonium.
Fuels include sulphur, finely divided aluminium, magnesium, titanium,
zinc, charcoal, sugar, red gum and shellac.
This paper illustrates the usefulness of dispersive Raman microspectrophotometry for the detection of low explosives and their combustion
products. Major techniques for the analysis of low explosives include
stereomicroscopy to mechanically separate individual particles and
crystals, scanning electron microscopy with energy dispersive x-ray
analysis (SEM/EDX) to determine elemental composition and morphology
of particles, polarised light microscopy (PLM) to screen and differentiate
crystals, microchemical (spot) tests, ion chromatography (IC) for soluble
ions in water extracts, and Fourier Transform infrared (FT-IR) microspectrophotometry for molecular structure elucidation.
Current techniques however suffer from several limitations.
SEM/EDX is non-destructive and extremely sensitive and powerful for elemental composition but cannot identify molecular and ionic species.
Microchemical tests are destructive and often lack sensitivity and specificity; expected color changes may also be masked by interferences. Ion
chromatography is a destructive separation technique and although sensitive, is based on matching retention times since conductivity detectors do
not discriminate ionic species. In recent years, advances in Raman spectrometer design, improved lasers and detectors, faster acquisition of Raman
spectral data, increased sensitivity, easier optical alignment and instrument
operation, new approaches to reduce fluorescence masking, and greater
affordability have led to the growing popularity of Raman spectrometry as
an alternative vibrational spectroscopic technique.
Raman spectroscopy has widely been reported as having several
advantages over infrared spectroscopy. Raman analysis requires minimal
or no sample preparation. Unlike IR spectroscopy, the Raman technique is
not affected by atmospheric moisture. Glass cells and aqueous solutions
may be used to obtain Raman spectra and the sample can often be
examined in situ non-intrusively. The Raman spectrum covers a wider
range from 150 to 4000 cm-1, compared to micro-FT-IR which often uses
a mercury cadmium telluride (MCT) detector limited to the range 750-4000
cm-1. The far-IR region below 750 cm-1 often has absorption bands with
useful molecular information. The IR and Raman spectra of a sample may
differ considerably and hence each technique can provide additional, complementary information regarding the sample. Infrared-inactive bands may
be observed by Raman spectroscopy, and bands that are weak in IR spectra
are often strong in Raman spectra.
Materials and Methods: Analyses were performed on a Renishaw
RM1000 Raman spectrometer. The spectrometer was calibrated using a
silicon standard.
A) General comparison of oxidisers and combustion products
To ascertain whether oxidisers and their combustion products
94
can be differentiated using Raman microscopy, the following
solid phase salts were analysed and their spectra compared:
potassium nitrate, potassium chlorate, potassium perchlorate,
sodium nitrite, potassium chloride, potassium carbonate, and
potassium sulphate. The specificity of Raman spectra for solid
phase nitrates, chlorates, and perchlorates were also studied by
varying the cation and monitoring Raman shifts for the different
vibrational modes. Small amounts of the solids were placed on
ordinary glass slides. Samples mounted on graphite stubs for
SEM/EDX analysis could also be directly analysed in the Raman
microscope.
B) Repeatability of Raman shift measurements
Repeatability of Raman shifts was studied by performing two
runs a day over three successive days. Up to 4 principal peaks
were monitored for the six runs. The mean, standard deviation
and coefficient of variation were then calculated. This study was
applied to 8 oxidisers and 4 combustion products.
C) Analysis of aqueous solutions
As water is often used to extract post-blast debris for analysis,
aqueous solutions of the oxidisers and combustion products were
also analysed using the technique. Solutions of 1% and 5%
(w/v) of 24 salts prepared using DI water. A sample volume of
15 µL (0.15 - 0.7 mg solute) of solution was drawn into and
sealed in a capillary tube (3.5 cm long x 1.5 mm outer diameter.).
The tube was placed directly in the path-length of the laser beam.
The effects on Raman shifts from hydration of ions dissolved in
aqueous solution were investigated.
D) Analysis of mixed salts recrystallised from aqueous solutions
Ion exchange upon crystallisation of mixed salts from the
evaporation of aqueous solutions was studied. A small volume
(30 µL) of 1% or 5% solution (containing 0.3-1.5 mg solute) was
placed in a cavity slide and evaporated to dryness using the
“quick dry” approach or the “slow dry” approach. “Quick dry”
consisted of drying on a hotplate at 60oC for 5-10 minutes.
“Slow dry” was carried out under natural unforced conditions at
ambient humidity and 22oC for 6-8 hours. The crystals were
sampled in the same way as for original solid materials. A small
amount of the solid was placed on glass slide or mounted on a
carbon stub.
Results and Discussion:
A) General comparison of oxidisers and combustion products
The number of peaks, Raman shifts and peak intensities and
widths of common oxidisers and combustion products were
found to be significantly different, allowing the different
oxyanions, sulphate nitrate, chlorate, perchlorate, nitrite,
chloride, carbonate, and sulphate to be readily differentiated.
Raman spectra are unique for the different functional groups
(anions). For each anion, the solid phase Raman spectra were
found to be specific for each mating cation.
B) Repeatability of measurements
Good repeatability was obtained for Raman measurements. The
worst case occurred for sodium salts; slight irregularities in peak
shapes contributed to the apparent shifts. Since identifications
are based on several peaks in the spectrum, this repeatability was
sufficient for conclusive identification of oxidisers and their
combustion products.
C) Analysis of aqueous solutions
In aqueous solution, the Raman spectra of nitrates of ammonium,
barium, sodium, and potassium could not be differentiated. The
effect of cations disappeared for the salts in solution. The spectra
showed higher base-line, peak broadening, loss of small peaks
and shoulders, shorter peaks, and lower resolution. Shifts were
observed in the peaks between solid state and dissolved salts.
Raman spectra of recrystallised oxidisers were indistinguishable
from those of the original solid salts.
* Presenting Author
D) Analysis of mixed salts recrystallised from aqueous solutions
Ion exchange was observed in some cases but not in others.
Crystallisation is influenced by the relative solubilities and ionic
radii of the competing ions in solution.
Conclusion: Results indicate that Raman microscopy is a very powerful non-destructive technique that can easily identify oxidisers at low
detection limits. Spectral resolution was of the order of 1 cm-1, and Raman
spectroscopy was found to conclusively identify ionic species, even in
aqueous solutions. High spatial resolution was achieved; a microscope
objective of 50x gave a laser spot size of 2 microns on the sample, indicating a high sensitivity of approximately 20 picograms of material.
Combined with elemental information from SEM/EDX, the new Raman
technique allows quick identification of both the cationic and anionic moieties of oxidisers with minimal sample preparation.
Raman Microscopy, Low Explosives, Oxidisers
B124 Raman Microscopy of Low Explosives
Obtained From Sparkler Material
Ming-Kiong Michael Tay, PhD, MBA*, Chin-Chin Lim, MSc, MBA*,
Poh Ling Chia, BSc, and Wanjing Su, Centre for Forensic Science, Health
Sciences Authority, 11 Outram Road, Singapore, 169078, Singapore
The goal of this presentation is to present results of a study on the
Raman microspectrophotometry of common ingredients in sparklers and
their combustion products. This paper is the sequel to an earlier paper
presented in this Meeting, titled “Raman microscopy of low explosives and
their combustion products.”
humanity by illustrataing that sparklers are a convenient source of low
explosives and that burnt and unburnt sparkler materials can be easily identified using Raman microscopy.
Background: Low explosives are often used in homemade bombs
and improvised explosive devices (IEDs). Although low explosives normally deflagrate burning very rapidly at a subsonic propagation velocity,
they can generate the gas pressure necessary for an explosion if confined
within an appropriate container. Inorganic low explosives usually consist
of oxidizer-fuel mixtures. They can be made using ordinary laboratory
chemicals, ammonium nitrate fertilizer, black powder, and pyrotechnic
materials from sparklers, flash powders, and fireworks.
Sparklers are a convenient source of low explosives for small
homemade devices. Two main types of sparklers are widely available:
wire sparklers and tube sparklers. Wire sparklers are more common and
consist of pyrotechnic mixture coated on a length of fairly rigid metal wire.
Variants of wire sparklers include dipped sticks where the pyrotechnic
mixture is coated on a stick, whistling sparklers that emit a shrill whistle,
and crackling sparklers that produce a series of sharp popping or crackling
sounds as they burn. Tubed sparklers (or cylindrical fountains) contain the
pyrotechnic mixture in loosely-filled cylindrical tubes that resemble pencils
in size and shape. A priming mixture is often painted on the tip of sparklers
to make ignition easier. Sparklers are stable at room temperature and normally safe to be hand-held for ignition. Lighting the ignition tip results in
a flame that propagates down the wire or tube, producing a flame envelope
surrounded by shower of colored sparks.
Pyrotechnic materials can be easily scraped off wire sparklers or
emptied out of a large number of tubed sparklers. Alternatively, wire
sparklers can be bundled together using tape to increase explosive effects.
The typical pyrotechnic composition of sparklers is a mixture of oxidiser,
fuel, combustible binder (eg, sugar, starch, gum arabic and shellac) and a
color agent. Fuels include fine metal powder (glazed iron, aluminium, zinc,
magnesium, titanium), meal gunpowder, sulfur and charcoal. Oxidisers are
usually nitrates, chlorates or perchlorates. In wire sparklers, the iron or
mild steel support wires also serve as a heat conductor, promoting the
* Presenting Author
smooth propagation of the pyrotechnic reaction along the sparkler.
Combustion produces a slight pressure, which ejects glowing metal
particles, forming sparks that cool quickly.
Nature of Study: In the earlier paper titled “Raman microscopy of
low explosives and their combustion products,” Raman microscopy was
shown to be a rapid, non-destructive and highly specific technique for identifying inorganic low explosives and their combustion products at low
detection limits. Raman microscopy identifies both the cationic and
anionic moieties of these substances with minimal sample preparation.
This second paper illustrates the application of dispersive Raman
microscopy to the identification of sparkler materials and their combustion
products. Scanning electron microscopy with energy dispersive x-ray
analysis (SEM/EDX) is a powerful screening technique to determine elemental composition, particle morphology and the presence of organic constituents, but cannot identify molecular and ionic species and therefore
needs to be complemented by a spectroscopic technique such as Raman
microscopy. Raman analysis does not give signals for metals, chlorides and
some oxides but these elements are readily detected in SEM/EDX analysis.
Water extraction allows separation of water-soluble components and
oxidisers from the matrix, simplifying subsequent identifications. A twoprong approach combining SEM/EDX and Raman microscopy is recommended for the conclusive identification of inorganic explosive ingredients.
Materials and Methods: Analyses were performed on a Renishaw
RM1000 dispersive Raman spectrometer. The spectrometer was calibrated
using a silicon standard. Materials studied were several commercially
available wire sparklers. Sparkler materials were analysed before and after
combustion, in solid form and aqueous extracts.
Sampling method for Raman analysis: Small amounts of the unburnt,
burnt or recrystallised solids were placed on ordinary glass slides. Samples
mounted on graphite stubs for SEM/EDX analysis were also directly
analysed in the Raman microscope. Aqueous solutions were taken up into
glass capillary tubes for direct analysis in the Raman microscope.
Analysis of unburnt sparkler tip and body: Materials were carefully
scraped and removed from the different layers of pyrotechnic coating for
SEM/EDX and Raman analyses. These materials were also extracted with
DI water, and the extracts analysed in aqueous solution and as dried recrystallised form.
Analysis of combustion products: A sparkler was burnt and materials
were carefully sampled from different parts (tip, middle, bottom, exterior,
core) of it for SEM/EDX and Raman analyses. DI water was also used to
extract post-combustion debris for any residual water-soluble products.
Results and Discussion: The results for a 12-inch whistling sparkler
are presented in this abstract. Additional results for other sparklers will be
presented and discussed further during the oral presentation. The whistling
sparklers came in a box of 100, priced at about $4-5 USD a box. Each
sparkler was 29.5 cm long and had a pyrotechnic coating measuring 13.7
cm in length. The average weight of a sparkler was 6.05 g. The average
amount of pyrotechnic coating on each sparkler was 3.55 g. Each sparkler
had a greenish ignition tip, a grey exterior and a white core. The white
whistling core was present only in the upper part.
Analysis of unburnt whistling sparkler materials: Raman analysis
indicated that the unburnt sparkler tip contained mostly barium nitrate (oxidiser) and antimony sulfide (fuel and enhancer of sound effects). The white
core of the unburnt sparkler contained mainly potassium perchlorate (oxidiser) and a small amount of organic ingredients. T he exterior contained
mainly barium nitrate, carbon and silicon nitride (a refractory material that
raises the flame temperature and prevents caking). SEM/EDX indicated the
presence of aluminium powder (fuel).
Analysis of solids recrystallised from water extracts of unburnt
sparkler: Recrystallised materials from water extracts of a mixture of
exterior and core materials contained barium nitrate and potassium perchlorate, indicating that no ion exchange occurred during recrystallisation.
Analysis of combustion products: The whistling sparkler burned with
golden sparks for 45 s and emitted a shrill whistling sound for the initial 5
seconds. The ignition tip and the white whistling core were consumed,
95
leaving a hollow shell in the upper part of the wire and a reduced diameter
in the rest of the wire. The average weight of solid residues left was 1.8 g
and the loss on ignition was 1.74 g (49% loss). The upper part of the burnt
body yielded materials with no significant peaks in Raman analysis, but
SEM/EDX analysis indicated barium, aluminium, oxygen potassium and
chlorine peaks, consistent with barium oxide, aluminium oxide, and
potassium chloride. The lower burnt body also contained carbon with trace
amounts of silicon nitride. Material from the burnt body gave little solid
residue when extracted with water.
Conclusion: Sparklers are a convenient and readily available source
of premixed low explosives for making small IEDs. The inorganic ingredients used in sparkler compositions and their corresponding combustion
products can be conclusively identified using SEM/EDX and Raman
microscopy. Raman microscopy provided rapid, sensitive and unequivocal
information on molecular and ionic structures. Metal particles, and some
metal oxides and chlorides were not detected by Raman analysis but were
easily detected by SEM/EDX analysis. A two-prong approach combining
the strengths of Raman microscopy and SEM/EDX offers clear advantages
over traditional techniques such as polarised light microscopy and microchemical (spot) tests.
The authors are grateful to Mr Wong Soon Meng of the Criminalistics
Laboratory for performing SEM/EDX analyses, and taking photographs
and scans for the Powerpoint presentation.
Raman Microscopy, Sparklers, Low Explosives
B125 Identification of Household Chemicals
Used in Small Bombs via Analysis
of Residual Materials
Kirstin McDonald, BA, BS*, and Melvin Shaw, MS, New York Police
Department Laboratory, 150-14 Jamaica Avenue, Jamaica, NY 11432
Attendees will obtain information on methodology for the identification of reactants used in a specific type of bottle bomb (also known as
chemical or “MacGyver” bombs) by analysis of product residues that result
from the mixing of certain household chemicals with commonly available
liquids.
humanity by providing forensic examiners with information and data useful
in identifying chemical bombs made from household products containing
halogenated organic compounds; the identification of an original reactant
can be used to narrow the search for possible household chemical sources
and thus provide an investigative lead. This presentation will also raise
awareness of the increasing popularity of these types of bottle bombs and
the availability of “recipes” for them on the Internet.
Bottle bombs have commonly been made by combining aluminum
foil and either muriatic acid (hydrochloric acid) or lye (sodium hydroxide)
drain cleaner and water in a plastic bottle, which is then tightly capped and
shaken. The resultant build-up in gas pressure causes the bottle to violently
burst, and may spray caustic or corrosive liquid. While these devices are
often set off as a mere prank, they have been known to cause property
damage and/or physical injury. Recently, a growing number of bottle
bombs encountered at the New York City Police Laboratory have been not
of the afore-mentioned type, but the combination of certain pool and toilet
tank tablets with rubbing alcohol. A number of household chemicals
contain certain halogenated organic compounds in sufficient concentration
which, when mixed with water or other liquids will produce a large volume
of gas upon decomposition. These products include pool and spa chlorinators and brominators, and automatic toilet tank cleaners.
The first step in this study was to identify products that contain the
organic compounds used in these types of devices. This was done by
searching stores, browsing online vendors, and looking through the
National Institutes of Heath Household Products Database
(http://householdproducts.nlm.nih.gov/).
96
In the second step, several pool and toilet chemicals containing such
compounds as trichloroisocyanuric acid, sodium dichloroisocyanurate,
dichloro-5,5-dimethylhydantoin, and bromochloro-5,5-dimethylhydantoin
were mixed under controlled conditions with tap water, rubbing alcohol,
and soda-pop. The third step was to take reagent quality compounds in the
above list and react them with distilled water and solvent grade isopropyl
and ethyl alcohols. The solid residues remaining from each were dried, and
then analyzed using gas chromatography-mass spectrometry (GC-MS),
Fourier Transform infrared spectroscopy (FTIR), dispersive Raman spectroscopy, and x-ray fluorescence (XRF) and x-ray diffraction (XRD). This
multi-instrument approach allowed for several points of comparison
between the chemical products of steps two and three and reagent grade
standards.
It was found that the original solid reactant was easily identified based
on characterization of the reaction product. All chromatograms, spectra,
and diffraction patterns from the reactions and standards were retained as a
reference for future casework.
Chemical Bombs, Household Products, Halogenated Organic
Compounds
B126 Inter-Laboratory Study on Bone Extraction
for Mitochondrial DNA Analysis
Constance L. Fisher, PhD*, FBI Laboratory, DNAU II, 2501
Investigation Parkway, Quantico, VA 22135
The goal of this presentation is to present the planned round-robin
study to the forensic mitochondrial DNA community and encourage the
participation of all commercial and government forensic mitochondrial
DNA laboratories in the United States and abroad.
humanity by increasing awareness of this study and maximize participation
among government, commercial mtDNA laboratories in the U.S. and
abroad
With the implementation of the National Missing Persons DNA
Database, the forensic DNA analysis of remains consisting of bone evidence continues to increase. Since the DNA found in bone evidence is frequently limiting and/or degraded, mitochondrial DNA (mtDNA) analysis is
often the analysis method of choice. In addition to the government and
commercial laboratories currently conducting mtDNA analysis, several
additional forensic mtDNA laboratories, including the FBI’s Regional
mitochondrial DNA laboratories, New York City Office of the Chief
Medical Examiner, and California Department of Justice, are completing
internal validation studies and are preparing to begin casework. It is anticipated that a substantial portion of this casework will deal with remains
from missing persons. However, the availability of human bones for
training purposes is limited. Furthermore, to date, no proficiency test is
available using bones as the evidentiary material.
The Mitochondrial DNA Subcommittee of the Scientific Working
Group on DNA Analysis Methods (SWGDAM) is assembling an inter-laboratory study comparing the extraction methodologies and sequencing
results obtained from a single source of bone sample. The study is designed
so that similar bones (ie. toe bones) or sections of a long bone (ie. femur)
will be obtained from a single donor and distributed to the participating laboratories. Extraction, amplification, and sequencing of the resulting bone
DNA will proceed according to the laboratories’ standard protocols.
Although full HV1 and HV2 sequencing results is desirable and recommended, partial mtDNA sequencing results from mini-primer sets may be
acceptable. In addition to mtDNA HV1 and HV2 sequencing data, autosomal STR, Y STR, as well as mtDNA coding region and non-HV1/HV2
control region SNP data will be evaluated if obtainable from the bone
sample.
In addition to submitting results of extraction yield and mtDNA
sequencing data, participating laboratories will complete a questionnaire
* Presenting Author
regarding details of their extraction methodologies as well as amplification
and sequencing strategies. Comparison of the results and extraction
methodologies may highlight differences in methodologies that can be
improved to give greater yield of high quality extracted DNA and/or
amplified product. In addition, it is expected that this exercise will lend
assurance to the field that subtle differences in amplification and
sequencing protocols do not lead to differing mtDNA profiles.
In order to provide the most benefit to the forensic mtDNA
community, all government and commercial forensic laboratories in the
U.S. and abroad currently conducting mtDNA testing are encouraged to
participate in this study. In addition, laboratories that anticipate conducting
mtDNA testing in the near future are also welcome to participate.
Contact information as well as a time-frame for participant response,
sample distribution, testing, results submission, and study analysis will be
discussed.
mtDNA, Bone, Inter-Laboratory
B127 The Influence of Skeletal Weathering
and Bone Type on MtDNA Analysis
Lisa M. Misner, MS*, Michigan State University, Forensic Science
Program, School of Criminal Justice, 560 Baker Hall, East Lansing, MI
48824; Douglas H. Ubelaker, PhD, Smithsonian Institution, Department
of Anthropology, NMNH, MRC 112, Washington, DC 20560; and David
R. Foran, PhD, Michigan State University, Forensic Science Program,
School of Criminal Justice and Department of Zoology, 560 Baker Hall,
East Lansing, MI 48824
After attending this presentation, attendees will learn in what way
bone type and its level of weathering, as well as age and sex of the
deceased, can be used to help predict the success of mtDNA typing of
skeletal material.
By using these types of objective comparisons of bone condition and
type presented, and individual age and sex, the forensic biologist should be
able to better predict the likelihood of successfully amplifying mtDNA from
weathered bone, and devise strategies for targeting amplicon length. This presentation will impact the forensic community and/or humanity by increasing
the productivity and efficiency of DNA analysis of skeletal material.
Forensic investigation of human skeletal remains may require DNA
analysis for identification. In many instances such remains are in poor
physical condition owing to weathering. This leaves the forensic biologist
with the difficulty of predicting how to commence with the analysis, or
whether DNA analysis might be successful at all. The goal of this study
was to determine if the degradative state of skeletal remains can be used in
a predictive manner with regard to mitochondrial DNA (mtDNA) analysis.
Further, bone type was examined to establish what role it plays in DNA
recovery from weathered bone. Information regarding the sex and estimated age of each individual was also compared to amplification success.
Analysis of Variance (ANOVA) was used to test for differences in amplification success among the samples, considering each of these variables. The
likelihood of successfully amplifying DNA based on the outer appearance
of a bone, as well as the type of bone in question, and what size DNA
fragment should be targeted would allow the forensic biologist to begin
analysis on skeletal material with the greatest chance of producing results,
reducing both the time and resources spent on analysis of aged skeletal
remains.
In this study, mtDNA was isolated and amplified from a series of
skeletons found in an abandoned cemetery in Pittsburgh, Pennsylvania.
The cemetery was utilized by Swiss-German immigrants from 1833 to
1861, after which it was eventually built over and subsequently uncovered
during an Interstate expansion project in 1987. Over 700 graves were
found, and all remains were analyzed anthropologically. The level of
weathering was assessed for whole skeletons, and later for individual
* Presenting Author
bones, to determine if either or both would be beneficial for predicting PCR
success and mtDNA quality. Skeletons were graded on a 0 to 5 scale, with
5 being the most weathered, representing bone that crumbled easily.
Multiple bone types from skeletons at five out of six stages (1 – 5) were
tested genetically. These same sets of bones were regraded on a 1 to 4 scale
based on individual bone weathering. Maximum mtDNA amplification
size was assessed using primers that produced amplicons of 107 bp, 220 bp
329 bp, and 402 bp.
The analysis of this material allowed researchers to determine statistically what influence skeletal and/or bone weathering conditions have on
successful mtDNA analysis, as well as what role the type of bone plays.
Variables such as the sex and age of the deceased were also included. By
using these types of objective comparisons of bone condition and type, and
individual age and sex, the forensic biologist should be able to better
predict the likelihood of successfully amplifying mtDNA from weathered
bone, and devise strategies for targeting amplicon length. This then, would
increase the productivity and efficiency of DNA analysis of skeletal
material.
MtDNA, Bone Degradation, Skeletal Remains
B128 Validation of the Roche Linear Array
Mitochondrial DNA HVI/HVII
Region-Sequence Typing Kit
David R. Fisher, BS*, Jason C. Kolowski, MS, Paul Goncharoff, PhD,
Mechthild Prinz, PhD, Howard Baum, PhD, and Robert Shaler, PhD,
Office of Chief Medical Examiner, 520 First Avenue, New York, NY 10016
After attending this presentation, attendees will learn that the Roche
Linear Array Mitochondrial DNA HVI/HVII Region-Sequence Typing Kit
is validated for use as a screening method in forensic casework.
humanity by demonstrating the use of the Roche Linear Array mtDNA
sequence typing kit that will decrease casework turnaround time by quickly
screening for exclusions, thereby allowing the analyst to focus on more
probative samples.
Mitochondrial DNA (mtDNA) typing is a useful tool in the forensic
biology laboratory due to the high mtDNA copy number per cell, high
degree of polymorphism, and maternal inheritance. MtDNA typing is often
successful in yielding profiles in cases where there is an insufficient amount
or quality of DNA for nuclear STR DNA testing. While direct DNA
sequencing is commonly used to determine mtDNA sequence variation, the
Linear Array assay is a more simple and rapid method (e.g. the procedure
can be done in about 2 hours versus several days for DNA sequencing) that
can be used as a screening technique in mtDNA casework.
This presentation will demonstrate that the Roche Linear Array strips
are a specific, sensitive, and robust method for the detection of sequence
variation in hypervariable regions I and II (HVI/HVII) of the mtDNA
control region. During the course of the validation for the new mtDNA laboratory at the NYC Office of Chief Medical Examiner, several different
studies were performed on the Linear Array strips to meet the current
SWGDAM guidelines for DNA analysis.
Sensitivity studies revealed that the most favorable banding and
intensity patterns were achieved with approximately 75ng of amplified
DNA. Mixture studies revealed that minor components could be seen at a
50:1 ratio, indicating that the array is highly sensitive. Non-probative
samples from different tissue types, including, hair, muscle, and bone, were
also typed with the Linear Array strips and were found to be in agreement
with typing results from direct DNA sequencing. Typing of all laboratory
staff was also performed to maintain an in-house database to rule out possible contamination concerns. Lastly, decontamination procedures, such as
cleansing gloves in bleach, were employed to minimize the number of
failed negative controls.
mtDNA, Linear Array, Validation
97
B129 How Well Can Race be
Predicted From mtDNA?
Mark D. Leney, PhD*, Joint POW/MIA Accounting Command, Central
Identification Laboratory, 310 Worchester, Hickam Air Force Base,
HI 96853
After attending this presentation, attendees will learn a technique to
predict likely self-identified race from an unknown mtDNA profile and to
attach statistical weight to such an attribution
humanity by allowing explicit calculation of the likely race of an unknown
from mtDNA. While not as accurate as nuclear DNA based techniques
designed to estimate biological ancestry this will work to provide additional
information for a biological profile of a unknown person where nuclear
DNA cannot be recovered and could augment nuclear DNA based
techniques by flagging the likely race of the mother of an unknown
contributor of mixed ancestry.
While mitochondrial DNA (mtDNA) in forensic contexts has
generally been used to support or refute identification hypotheses, it also
contains information that permits inference of the race of an unknown
person contributing the mtDNA profile. The mtDNA population database
was compiled to provide the forensic community with frequency estimates
for mtDNA hypervariable region (mtDNA HVR) profiles observed in
evidence-to-reference matches for a specific population of interest.
However, the database can also be used to find the frequencies of matching
or closely related mtDNA HVR profiles of unknown origin in several
different ethnic/racial sub-samples. As the majority of all profiles in the
mtDNA population database are themselves unique within the database, it
is no surprise that most evidentiary profiles are also observed zero or one
times in the database. While such a low frequency is adequate for establishing the relative rarity of the profile in question, it is not informative of
probable racial/ethnic origin of the contributor. Nevertheless, as most individuals are only distinguished by a few polymorphisms in the mtDNA
HVR from multiple individuals in the database, the pool of closely related
individuals is a much richer source of information for estimation of
probable ancestry.
Attendees will learn how a simple likelihood ratio can be constructed
from the probability of observing closely related profiles to an unknown
evidence profile in a specific racial or ethnic sub-group and the probability
of observing equally related profiles in the rest of the database. Attendees
will then observe that by calculating such a ratio for each racial or ethnic
sub-group of interest for all possible degrees of profile relatedness it is possible to determine the peak likelihood ratio for racial or ethnic sub-group
attribution. This peak represents the balance between idiosyncratic polymorphic differences that are a result of recent within-lineage mutations and
older polymorphic differences that are a result of shared common ancestry.
The height of the peak indicates the statistical weight of the racial or ethnic
attribution. The attendees will also be able to review validation studies
conducted on profiles drawn at random from the mtDNA population
database and from unrelated but known mtDNA HVR profiles.
Neither race nor ethnicity is an absolute biological category but each
does contain a biological component. This shared genetic heritage is what
allows this technique to work. However, the mtDNA population database
is based on self-identified race and ethnicity and thus various other factors
act to degrade the power and accuracy of the technique. The main factors
are cultural biases in the reporting or recording of single racial or ethnic
categories (when many people are actually of mixed ancestry) coupled with
the solely matrilineal nature of mtDNA inheritance. These factors will be
reviewed and their impact on careful and proper interpretation of results
will be discussed.
Additionally the applicability of the technique depends on adequate
sampling of the populations in question by the database used. The presentation will briefly cover the diversity in the published database, indicating
98
where the database is adequate and where it falls short, giving examples
from casework to indicate potential pitfalls in interpretation when a profile
from an underrepresented population is analyzed.
This technique offers a novel method for placing an explicit statistical
value on inference of racial or ethnic group from an mtDNA profile. This
could provide a useful lead in building a biological profile of an unknown
contributor where only mtDNA was recoverable (as is often the case where
conventional nuclear DNA testing fails). Furthermore it could be used in
conjunction with the recently developed techniques that estimate biological
ancestry from nuclear DNA markers; for example in a person of mixed
ancestry, the use of this technique could provide a likely estimate of the
self-identified race of the unknown contributor’s mother. At the Joint
POW/MIA Accounting Command it is hoped that the technique will assist
case resolution for long-term cold cases by highlighting those fragmentary
remains that are likely to be unidentified American casualties and those that
are likely to derive from indigenous Asian combatants and civilians from
the battlefields of Korea and Vietnam.
Race, Ancestry, Mitochondrial DNA
B130 A Modified Hair Extraction Technique
for Mitochondrial DNA Analysis
Jason C. Kolowski, MS*, Paul Goncharoff, PhD, Metchild Prinz, PhD,
and Robert Shaler, PhD, Department of Forensic Biology, Office of the
Chief Medical Examiner, 520 1st Avenue, New York, NY 10016
After attending this presentation, attendees will learn about a modified
technique for the processing of evidentiary hairs for use in mitochondrial
DNA testing, including, but not limited to, the documentation, handling,
washing, and extraction technique employed by the mitochondrial DNA
laboratory at the Office of Chief Medical Examiner in New York City.
humanity by demonstrating the evidentiary value of hair, whether collected
from a crime scene, taken from a body at autopsy, or lifted from evidence
in the laboratory, cannot be underestimated. An improved way to process
hair evidence for mitochondrial DNA testing will be useful in forensic
casework.
In the course of implementing a mitochondrial DNA laboratory for the
Office of Chief Medical Examiner in New York City, a validation study on
hair extraction was performed to ensure the proper handling and processing
of evidentiary hairs in forensic casework. One of the goals was to improve
the enzymatic digestion technique and to eliminate the high cost and timeconsuming process of manually grinding hairs, which is also a possible
source of contamination. To ensure the cleanliness of the hair, a technique
of cleaning the hair was developed in which the evidentiary hairs were
immobilized on a moist membrane following sonication in a detergent.
The membrane, being liquid permeable, allowed the hair to be washed with
a variety of reagents and dried in open air without risking the loss of the
sample. An enzymatic digestion technique was modified and optimized
using regular laboratory-grade reagents, resulting in the complete digestion
of a standard 2 cm cutting of a hair shaft in under a half-hour, in nearly all
of the samples tested. A variety of studies were carried out on the quality
of obtaining viable sequence data from previously mounted hairs, as well
as a sensitivity study on the necessary length of the hair prior to enzymatic
digestions. Several studies on chemically treated/dyed hair were carried
out as well. The enzymatic digestion technique was successful in obtaining
mitochondrial DNA from all types of hair, regardless of the mountant or
fixative, regardless of chemical alteration or dyes, and from as little as 2
mm of hair shaft. A high success rate was observed in obtaining highquality mitochondrial sequence data from all of the hair extracts (regardless
of complete digestion of the hair shaft), initially using Linear Array strips
from Roche Applied Science, and confirmed by DNA sequencing and 3100
analysis.
* Presenting Author
The forensic documentation of the hairs, prior to the processing for
extraction, was done on a stereomicroscope from Mideo Systems Inc.,
allowing for the rapid identification, measurement, and photography of the
hair, including the region of interest that would be submitted for the
extraction of mitochondrial DNA. Furthermore, the use of dead-air hoods
from Labconco and the strict adherence to a conservative decontamination
policy in a dedicated pre-amplified room served to reduce the overall
effects of contamination and sample loss that are common when dealing
with mitochondrial DNA analysis and evidentiary hairs.
Mitochondrial DNA, Hair, Extraction
B131 A Human Mitochondrial DNA
Database Derived From Casework
at Mitotyping Technologies
Terry Melton, PhD*, and Kimberlyn Nelson, PhD, Mitotyping
Technologies, 2565 Park Center Boulevard, Suite 200, State College,
PA 16801
After attending this presentation, attendees will know about the
diversity and distribution of mitochondrial DNA control region sequences
observed in a caseworking forensic mitochondrial DNA laboratory.
humanity by demonstrating Forensic mitochondrial DNA analysis is being
applied more broadly and frequently. However, forensic mtDNA practitioners rarely present DNA sequence data that they are gathering, and
studies on the mtDNA variation present in North America are few. The data
presented here will build the scientific understanding of all practitioners,
and enhance the application of this type of DNA testing.
Between January 1999 and June 2004, Mitotyping Technologies
collected 854 human mitochondrial DNA sequences for an internal
database. Sequences were complete hypervariable region 1 and hypervariable region 2 nucleotide sequences encompassing positions 1599816400 and 30-407, respectively. A total of at least 783 nucleotides were
available for each sequence. Identical sequences within a case (indicating
that a match had been obtained between two or more samples within a case)
were included only one time in the database. Therefore the samples are
assumed to be randomly collected convenience samples derived from both
questioned and known samples (blood, bone, hair, saliva, and other tissues)
from most of the 50 United States, Canada, and the Caribbean. In most
cases, an ethnic/biogeographical identity for the sequence (African/African
American, Asian, Caucasian/European, Hispanic, and Native American)
could be assigned based on either haplogroup-specific polymorphisms or
information submitted with the samples.
The sequences were analyzed for sequence diversity, average number
of nucleotide differences, haplogroup identity, and length heteroplasmy.
These variables were examined at an overall level, within classically
defined mtDNA haplogroups, and by state/geographic region. The results
were compared to previously published studies on mitochondrial DNA
diversity in the continental U.S. and internationally.
Overall, 72% (N=614) of the sequences could be classified as historically or biogeographically European while 17% (N=146) could be classified as historically or biogeographically African. Asian-, Hispanic-,
Native American-type or unclassifiable sequences comprised the remainder
of the sample. The electropherograms of unclassifiable sequences were reexamined for ambiguities or errors and were determined to be correct, indicating that the inability to classify these sequences was likely due to back
mutations that have erased haplogroup-specific polymorphisms.
Diversity among the Europe-derived sequences was 0.995, with an
average number of nucleotide differences of 8.2. Haplogroups H, I, J, K,
T, U, V, W, and X were represented in this group, with diversity values
ranging from 0.916 (V) to 1.0 (W, X). The average number of nucleotide
differences within these European haplogroups ranged from 2.7 (V) to 7.9
(U). Haplogroup H members, the most frequently observed group in all
* Presenting Author
published studies of European populations to date, comprised 38.4% of the
European samples, and had a diversity value of 0.973 and an average
number of nucleotide differences of 3.5. The “common” H1 haplotype
(263A?G, 315.1insC) was observed at frequencies of 3.7% in the database
overall and 5.7% within all European-derived sequences.
Among sequences determined to be historically or biogeographically
African, diversity was close to 1.0 (0.999), indicating that nearly every
sequence was unique in the database. The average number of nucleotide
differences among these sequences was 15.1. Haplogroup L1 comprised
28% of the African-origin sequences, haplogroup L2 comprised 20% of
these sequences, and haplogroup L3 comprised 36% of these sequences.
Individuals from subgroups L1a, L1b, L1c, L2a, L2b, L2c, L2d, L3b, L3d,
L3e, and L3f were represented from these three haplogroups. Diversity
within the subgroups was uniformly high (above 0.977) with the exception
of subgroup L1a (0.917).
Mitochondrial DNA, mtDNA Sequence Database, Criminalistics
B132 The FBI’s Regional Mitochondrial
DNA Laboratory Program
Alice R. Isenberg, PhD*, FBI Laboratory, 2501 Investigation Parkway,
Quantico, VA 22135
Aattending this presentation, the forensic community will be introduced to the four regional mitochondrial DNA laboratories funded by the
FBI to which they may submit cases for analysis at no-cost.
humanity by providing a better understanding of the possibilty for
increased throughput of mitochondrial DNA casework at no cost through
the FBI’s four regional mitochondrial DNA laboratories which will be
accepting casework in late 2005.
This presentation will familiarize the audience with a new program
initiated by the FBI to increase the availability of no-cost mitochondrial
DNA analyses to the law enforcement community. The FBI’s fiscal year
2003 budget included $4,000,000 to establish and operate four regional
mitochondrial DNA (mtDNA) laboratories. The Congressional authorization requires the FBI Laboratory to provide technical management and
quality assurance for regional labs and the regional labs to conduct mtDNA
analysis for both forensic casework and missing persons. Competitive procurement began in June of 2003 at a briefing with about 35 state and local
crime labs attending or requesting materials. Twelve applications were
received in mid-July and cooperative agreements were awarded in
September 2003 to the Arizona Department of Public Safety Central Crime
Laboratory in Phoenix, AZ, the Connecticut Forensic Science Laboratory
(Department of Public Safety) in Meriden, CT, the Minnesota Bureau of
Criminal Apprehension Forensic Science Laboratory in St. Paul, MN, and
the New Jersey State Police Laboratory in Hamilton, NJ. All four regional
mtDNA labs are state-wide, full-service crime labs accredited by
ASCLD/LAB in biology and trace evidence and have established forensic
nuclear DNA and CODIS/NDIS programs. Under the cooperative agreements, the FBI will train and equip regional laboratories and authorize
mtDNA cases to be analyzed according to the Quality Assurance Standards
and Scientific Working Group on DNA Analysis Methods (SWGDAM)
Guidelines for mtDNA Nucleotide Sequence Interpretation Guidelines.
The regional laboratories will provide facilities, employees, and supervision to conduct mtDNA casework, with the FBI reimbursing direct
expenses, including salaries and benefits for up to nine employees, space
renovation required for mtDNA operations, equipment and maintenance,
supplies, training, and travel. When the regional labs are operational, cases
will be directed to them and they will be responsible for performing
analysis, reporting results, and testifying, if necessary. Fully operational
regional labs will have the capacity to examine 120 cases per year, and the
regional lab will retain 25% of this capacity for internal allocation. The
remaining 75% will be allocated by the FBI for the regional lab’s service
99
area. The current status of the program and procedures for submission of
cases will be discussed. The regional mitochondrial DNA program will
more than double the nation’s capacity for no-cost forensic mtDNA
casework when fully operational in September 2005.
Mitochondrial DNA, Regional Laboratories, FBI Laboratory
B133 Beyond Laci Peterson: Using DNA
Analysis to Identify Missing Persons
John C. Tonkyn, PhD*, California Department of Justice/Missing Persons
DNA Program, 1001 West Cutting Boulevard, Suite 110, Richmond,
CA 94804
The goal of this presentation is to present to the forensic community
the development and implementation of a statewide program designed to
utilize DNA analysis to solve cases of missing and unidentified persons.
The challenges, both technical and administrative, will be described. The
need for a nationally coordinated effort will also be discussed.
humanity by providing an understanding of the methodology of identifying
persons using DNA, but an appreciation for the need for wider implementation of similar programs.
The identification of human remains is one of the primary duties of
coroners and medical examiners, and is a critical aspect of homicide investigation when the body is not readily identified. In addition to odontology,
fingerprints and anthropology, DNA analysis is a highly discriminating tool
that is available to identify remains, provided that there is a corresponding
reference sample available, either from biologically-related family
members or from the missing person themselves (i.e., baby tooth).
However, DNA analysis is expensive and body ID is a low priority for most
crime labs, so this tool remains vastly underused.
The goal of this presentation is to describe the implementation of a
statewide program that is successfully providing investigators with the
identity of human remains through a concerted effort involving the state
crime lab, the state missing person clearinghouse, coroners, medical examiners and local law enforcement. The California Missing Persons DNA
Program was created in 2001 with the express purpose of using DNA databases of both unidentified human remains and reference samples for
missing person (either swabs from relatives or items from the missing
person) to make identifications. Model collection kits have been devised
for the collection of oral swabs from family members of missing persons,
and for the collection of human remains. Training, in the form of instructional videos and written publications, has been developed. Outreach has
involved the identification of “high risk” missing person cases and unidentified person cases reported to the state clearinghouse, and coordination
with coroners and law enforcement investigators for the collection of
appropriate samples. Short Tandem Repeat DNA profiles, as well as mitochondrial DNA sequencing data are entered into local databases as well as
the new “CODISmp,” which has been developed specifically for use with
missing and unidentified person DNA profiles. As most analyses involve
comparison between remains and a relative of the missing person, kinship
analysis is required for comparison of nuclear DNA profiles.
While all states participate in CODIS, the primary categories of
samples entered are convicted offender and forensic unknown. Few labs
routinely enter profiles from missing or unidentified persons, and fewer still
have dedicated resources to this task. It is one of the goals of this presentation to provide a model for other states to consider when implementing a
program for the purpose of identifying human remains. Because of the
movement of individuals and families between states, a certain percentage
of cases either will not be analyzed or compared after analysis. A national
program of all states entering both STR and mitochondrial DNA into NDIS
is required, similar to the highly successful convicted offender/forensic
unknown model.
100
Several dozen identifications have been made to date. Technical
improvements in typing human remains will be discussed. These include
the following: 1) Improved methods for DNA extraction, 2) qPCR
methods that simultaneously quantify the amount of both nuclear and mitochondrial DNA, and 3) the use of a duplex PCR reaction for the simultaneous amplification of both HV1 and HV2 regions of mitochondrial DNA
(thereby conserving sample which contains little DNA to begin with).
Finally, several successful cases will be described that highlight the issues
and technologies describe above.
Missing Person, Mitochondrial DNA, Unidentified Person
B134 Optimization of Mini Plex Primer Sets
for STR Testing of DNA Extracts From
Bone Samples 10 – 13 Years Postmortem
Jon Davoren, MS*, International Commission on Missing Persons,
Alipasina 45a, Sarajevo, 71000, Boania and Herzegovina; Michael
Coble, PhD, National Institute of Standards and Technology, 100 Bureau
Drive, Mail Stop 8311, Gaithersburg, MD 20899-8311; and Tony
Donlon, BS, Ana Milos, BS, and Rijad Konjhodzic, BS, International
Commission on Missing Persons, Alipasina 45a, Sarajevo, 71000, Bosnia
and Herzegovina
The goal of this presentation is to describe some of the PCR
optimizations that have been performed on a number of reduced amplicon
primer sets for amplification of DNA from 10 – 13 year postmortem
skeletal remains. The work presented here will be useful for anyone
performing DNA STR testing of bone sample.
The goal of this presentation is to describe some of the PCR optimizations that have been performed on a number of reduced amplicon
primer sets for amplification of DNA from 10 – 13 year postmortem
skeletal remains.
The International Commission on Missing persons has developed a
DNA led identification system for identification of victims of the conflicts
resulting during the breakup of the former Yugoslavia. As a first step in the
identification effort bone samples were taken from whole skeletons and
tested using a silica-based extraction method and the Promega PowerPlex®
16 system. With the PP16 system results were obtained in approximately
85% of the samples tested. The 15% that were considered failures, during
the first phase, had between 0 and 11 loci amplified with most of the failed
loci being the longer PCR products.
To better understand why these samples were failing STR analysis
extracts were assessed using the Applied Biosystems Quantifiler™ Human
DNA quantification system. Most of the samples displayed relatively low
amounts of DNA (<10 pg/µl) and/or the presence of PCR inhibitors. The
results of both the quantification as well as the allelic drop outs in the longer
loci indicate that the DNA in these extracts may be degraded to the point
where commercially available STR kits are not effective.
In an attempt to get more STR data out of the DNA extracts, that failed
the initial phase of this testing, the possibility of using reduced amplicon
primer sets has been investigated. Initially a concordance study was performed to ensure that the alleles amplified by the new primer sets would
reflect the same alleles designated by the PP16 system and the Applied
Biosystems AMPFlSTR® SeFiler™ kits. Reduced amplicon primer sets
were also optimized for amplification of DNA isolated from a number of
bone samples. The optimizations tested include modifications to the PCR
buffer, Mg++, and different taq enzymes.
The results of the optimizations will be presented and compared to
optimizations of the PP16 and SeFiler kits. Additionally the effectiveness
of the mini primer sets for STR testing of DNA extracts from bone samples
will be discussed in detail.
STR, DNA, Mini Plex
* Presenting Author
B135 A Duplex Real-Time qPCR Assay
for the Quantification of Human
Nuclear and Mitochondrial DNA in
Forensic Samples: Implications for
Quantifying DNA in Degraded Samples
Mark D. Timken, PhD*, Katie Swango, PhD, Cristian Orrego, PhD, and
Martin R. Buoncristiani, MPH, California Department of Justice, Jan
Bashinski DNA Laboratory, 1001 West Cutting Boulevard, Suite 110,
Richmond, CA 94804
After attending this presentation, attendees will learn the advantages
of using a new duplex qPCR protocol for quantifying nuclear and
mitochondrial DNA in forensic sample; the implications of using qPCR
versus slot blot quantification methods for successfully genotyping
degraded DNA.
humanity by providing a new tool for DNA quantification in forensic
samples; to describe quantification differences, especially for samples
containing degraded DNA that can be expected when moving from slot blot
to qPCR quantitation methods.
This report describes selected results from validation of a duplex realtime qPCR assay that has been developed for the quantification of human
nuclear and mitochondrial DNA in forensic samples. This assay was
designed to be of general utility for forensic DNA quantifications, but to be
particularly useful for the post-extraction analysis of samples that contain
degraded DNA. Such samples, though not uncommon in standard
casework evidence, are often encountered in evidences from mass
disasters, mass graves, and missing persons’ cases. Presently, the initial
decision as to how to proceed with analysis of such samples, either by
nuclear STR or mitochondrial typing, is commonly based on a slot blot
quantification approach that (1) has been reported to underestimate the
quantity of nuclear DNA in degraded samples and in samples that contain
high levels of microbial contamination, (2) provides no information about
the quality (fragment length) of the quantified nuclear DNA, and (3) provides no direct information about the quantity of human mitochondrial
DNA in the sample. Due to these quantification deficiencies, the actual
forensic analysis of challenging samples often proceeds first by obtaining
inadequate STR typing results, and then by using any remaining extracted
DNA in an attempt to obtain mitochondrial typing results, the latter analysis
typically attempted without any direct knowledge of the presence (or
absence) of human mitochondrial genome in the DNA extract. The efficiency and quality of this analysis procedure can be improved substantially
by obtaining reliable estimates of the amounts of human nuclear and mitochondrial DNA in these samples. Based on such estimates, an optimal analytical approach can be selected at the outset, leading directly to optimal
genotyping or haplotyping results and to a concomitant savings in time, in
labor, in reagent/kit costs and of extracted DNA.
In the duplex nuclear-mitochondrial qPCR assay developed, the
authors quantify a nuclear target sequence that spans the repeat region of
the primate-specific TH01 STR locus, a locus that has been used widely for
forensic applications. This target sequence is of direct interest for quantification, considering that a primary reason for quantifying human nuclear
DNA in forensic samples is to determine the amount of extract to amplify
in a commercial multiplex STR PCR kit. For degraded samples, quantification of the relatively long TH01 target (~170-190bp) leads to improved
STR typing results, compared to typing results based on quantification by
slot blot hybridization. For the mitochondrial portion of the duplex qPCR
assay, the authors quantify a short target (69bp) in the mitochondrial ND1
gene. This selection provides a sensitive means for determining the
presence of human mitochondrial DNA, degraded or not, in forensic
samples. Although the presentation will focus mainly on quantification and
analysis of samples containing degraded DNA, the authors will also briefly
describe other results from validation work, including studies of precision,
* Presenting Author
reproducibility, sensitivity, species specificity, and applications to
casework-type samples.
qPCR, Duplex, Degraded DNA
B136 Significance of Detecting Foreign
Sources of DNA Under Fingernails
Melinda Matte, BSc*, Elida Kafarowski, MSc, Roger Frappier, MSc, and
Jonathan Newman, BSc, Centre of Forensic Sciences, 25 Grosvenor
Street, 4th Floor - Biology Section, Toronto, Ontario M7A 2G8, Canada
The goal of this presentation is to provide the forensic community
with a better foundation on which to base opinions with respect to DNA
fingernail evidence in casework.
humanity by providing the forensic community with data to validate their
opinion regarding DNA evidence from fingernail samples in courts of law.
Scientists at the Centre of Forensic Sciences (CFS) routinely examine
DNA results from fingernail scrapings and clippings in casework.
Fingernails are useful in forensic science as they can often be used to generate a DNA profile from the donor and any additional sources. Foreign
DNA beneath the fingernails can arise due to the transfer of skin cells or
body fluids as a result of intimate physical contact. While the ability to
detect foreign DNA profiles from fingernails has been demonstrated, their
evidentiary significance is afforded little attention in the literature.
Fingernail related items are submitted to the CFS for DNA testing in
one of two ways: scrapings or clippings. If the debris underneath the fingernails has been scraped with a wooden applicator stick prior to submission to the laboratory, then all of the scraped debris and the end of the
stick are subjected to DNA analysis. In cases where clippings have been
provided, the undersides of the fingernails are swabbed at the laboratory
prior to DNA analysis. Special attention is given to fingernail clippings
with blood staining; for these samples the blood, usually originating from
the fingernail donor, is swabbed separately from the remainder of the
underside of the fingernails. Experience is that this approach aids in the
detection of foreign DNA by separating out samples likely to contain very
high amounts of the donor’s DNA.
A study performed at the CFS, involving staff of the laboratory and
students from a local University, was undertaken to determine the prevalence of foreign DNA underneath the fingernails of individuals who share
work or household environments. A total of 39 participants provided 78
samples (from the left and right hands) for DNA analysis by scraping under
their fingernails with a wooden applicator stick. Of these samples, only
12% yielded a second source of DNA. When these were further categorized into samples where a significant foreign DNA profile was detected
(DNA results for at least 4 STR loci) then the number dropped to only 4%.
Further investigation determined that the foreign source of DNA could not
be attributed to fellow members of the household or work environment,
unless intimate physical contact had occurred. These results suggested that
casual contact between individuals is not likely to result in the deposition
of a second source of DNA beneath the fingernails.
The CFS maintains a database to track DNA results from fingernail
related items in casework. Since February 2003 the data from 95 cases
have been analyzed (a total of 187 samples). Homicides (67%) and sexual
assaults (26%) comprised the majority of cases with fingernail related
items. The majority (76%) of samples were submitted as clippings, while
22% were submitted as fingernail scrapings, and 2% contained both clippings and scrapings. Of the samples from fingernail clippings, 34% yielded
a foreign source of DNA, while 58% contained only DNA from the fingernail donor, and 8% yielded insufficient or no DNA for analysis. Of the
samples of fingernail scrapings, 29% yielded a foreign source of DNA,
40% contained only the fingernail donor’s DNA, and 31% yielded insufficient or no DNA for analysis.
101
The results indicate that the likelihood of detecting a foreign source of
DNA on fingernail clippings is greater than in scrapings. This may be a
result of the CFS method of sampling any blood separately on clippings to
prevent the “swamping out” of a foreign source of DNA with the donor’s
DNA during PCR. The data also suggest that fingernail samples can yield
useful investigative information when the case history warrants their
examination. However in casework, fingernail evidence is only examined
if the case history suggests an expectation of finding a foreign source of
DNA. Therefore one would expect a much higher prevalence of foreign
DNA relative to the controlled study.
Additional experimental data regarding both the prevalence and
persistence of foreign DNA profiles beneath fingernails under a variety of
conditions will be presented. It is expected that this data and research will
provide the forensic community with a strong foundation on which to base
opinion evidence in courts of law pertaining to the relevance of fingernail
findings in casework.
Fingernail Clippings, Fingernail Scrapings, DNA
B137 Development of a Human-Specific Real
Time PCR Assay for Simultaneous
Quantitation of Total Genomic and
Male DNA
Katie M. Horsman, MS*, University of Virginia, Department of
Chemistry, McCormick Road, Charlottesville, VA 22901; Jeffrey A.
Hickey, MS, Margaret A. Terrill, MSFS, and Robin W. Cotton, PhD,
Orchid Cellmark, 20271 Goldenrod Lane, Germantown, MD 20876;
James P. Landers, PhD, University of Virginia, Departments of Chemistry
and Pathology, McCormick Road, Charlottesville, VA 22901; and Lewis
O. Maddox, PhD, Orchid Cellmark, 20271 Goldenrod Lane,
The goal of this presentation is to describe the development and
validation of a duplex real time PCR method for simultaneous determination of total genomic and male DNA concentrations in a forensic sample.
humanity by demonstrating the real-time PCR assay which was developed
for simultaneous quantitation of total genomic and male DNA should be
utilized in forensic DNA analysis as a replacement to slot-blot quantitation.
Increased sensitivity, decreased analysis time, specific quantitation of male
and total genomic DNA make the assay superior to the slot-blot assay. In
addition, the multiplex assay results in time and cost savings when
compared to the ABI Quantifiler kits.
Historically, the slot-blot method has been used to quantitate human
DNA in forensic samples. However, the slot blot method is labor intensive,
subjective in interpretation, and not highly amenable to automation, which
has led to the development of new methods for quantitating human DNA.
Current research1,2 has focused on the use of Real-Time PCR as a more
accurate, more sensitive, and less labor intensive method. Real time PCR
has the capability of absolute quantitation based upon measurement of the
increase in fluorescence signal with each cycle and comparison to a
standard curve. A number of detection chemistries are currently available
including SYBR® Green detection, fluorogenic probes, and molecular
beacon technology. Fluorogenic probe chemistry was utilized in this study,
with spectrally distinguishable reporter dyes for each target sequence.
With the growing capabilities for discrimination based upon Y-chromosome STR typing, the need to quantitate the male contribution to a
sample is becoming increasingly evident. Commercial kits (Applied
Biosystems) for human DNA and Y-chromosome DNA quantitation with
real-time quantitative PCR are available in singleplex reactions. However,
multiplex PCR has the advantage of consuming half of the DNA as compared to the commercial kit in addition to reducing the cost of the analysis.
Therefore, a multiplex real time PCR assay has been developed for
simultaneous quantitation of both the total human genomic DNA concen102
tration as well as the male DNA component. Primer/probe sets were
designed using the Primer Express® (Applied Biosystems) software. For
total human genomic DNA quantitation, the amplicon is a 63bp fragment
of the TPOX locus. The Y-chromosome amplicon is a 70bp fragment of
the sex-determining region (SRY) of the Y-chromosome. Both primer
sequences were determined to be human (or higher-primate) specific with
a BLAST search as well as tested experimentally with common DNA
sources including yeast, E Coli, and mouse.
The lower limit of quantitation was determined to be approximately
10 pg for total genomic DNA and approximately 20 pg for male DNA. The
upper limit of the quantitation was set at 50 ng, which is appropriate for
typical casework samples. This linear range for the real time PCR quantitation is significantly larger than that of the 125 pg to 10 ng range of the
slot-blot assay. In direct comparison to a modified QuantiBlot® (Applied
Biosystems) assay followed by BioImage® analysis, the average relative
error of the multiplex assay was comparable to the slot-blot assay. The
average percent error was 11.6% for total genomic DNA and 12.1% for
male DNA, compared to 12.8% for the total genomic DNA quantitation by
slot blot. The slot-blot analysis is unable to specifically detect the concentration of male DNA in a mixture. A mixture-challenge study indicated the
quantitation of 25 pg male DNA was accurate in mixtures of up to 1:5000
male:female DNA.
Additional validation experiments included
optimization of Mg2+ concentration, comparison of quantitation accuracy
to the Quantifiler and Quantifiler Y kits, and assay reproducibility.
References:
1. Nicklas JA, Buel E. Development of an ALU-based , Real-Time PCR
Method for Quantitation of Human DNA in Forensic Samples. J Forensic
Sci. 2003; 48(5): 935-44.
2. Richard ML, Frappier RH, Newman JC. Developmental Validation of a
Real-Time Quantitative PCR Assay for Automated Quantification of
Human DNA. J Forensic Sci. 2003; 48(5): 1041-6.
DNA Quantitation, Real-Time PCR, Slot Blot
B138 Application of Real Time qPCR Multiplex
Results to Downstream Decision Making
in Samples Containing Mixtures of Male
and Female DNA
Jeffrey A. Hickey, MS*, Orchid Cellmark, 20271 Goldenrod Lane,
Germantown, MD 20876; Katie M. Horsman, MS, University of Virginia,
Department of Chemistry, Charlottesville, VA 22901; and Lewis O.
Maddox, PhD, and Robin W. Cotton, PhD, Orchid Cellmark, 20271
Goldenrod Lane, Germantown, MD 20876
The goal of this presentation is to describe the results of Real Time
PCR quantitation of male/female mixtures and the effect of this data on
decision making at the point of PCR amplification for STR loci.
humanity by providing data from a real time qPCR multiplex for simultaneous quantitation of total genomic and male DNA which can be used to
improve amplification decisions. This will assist analysts in determining
which DNA samples are likely to provide useful information when
amplified for autosomal STR and/or YSTR loci.
The availability of real time PCR (qPCR) methods capable of determining total genomic and male DNA in forensic samples has changed and
improved the decision making process for STR testing. Other quantitation
methods, such as the slot blot, do not provide information regarding the
relative amounts of male versus total genomic DNA and are much less
sensitive than real time PCR. Knowledge of the male DNA concentration
can be used to determine if the sample should be amplified with autosomal
and/or Y specific STR loci.
In this study, a real time qPCR multiplex capable of detecting male
and total genomic DNA in one reaction was used. This assay utilizes
* Presenting Author
Taqman probe chemistry and contains a primer/probe set for the TPOX
locus and a primer/probe set for the sex-determining region of the Y chromosome. The information gleaned from validation of this real-time
multiplex was used in concert with validation data from ABI Profiler
Plus™, COfiler™, and Promega PowerPlex Y® testing systems to make
decisions regarding the most effective approach for sample analysis.
Experiments were designed with the purpose of determining if real
time results are reliable predictors of both Y STR and autosomal STR
amplification results. For this study, several dilution series of male/female
mixtures were quantified for total genomic and male DNA using the real
time multiplex. After quantitation, all of the samples were amplified using
the PowerPlex Y kit and a subset was amplified using the Profiler Plus kit
as well. The PowerPlex Y® amplifications were based on the male specific
qPCR results, whereas the Profiler Plus amplifications were based on the
total genomic DNA qPCR results. The samples were then analyzed using
an ABI Prism 310 Genetic Analyzer.
The results showed that the real time qPCR multiplex used in these
experiments provides valuable quantitation data for both total genomic and
male DNA in mixed samples. The real time qPCR results for the
male/female dilution series confirmed that this assay detects male DNA in
a wide variety of male/female DNA mixtures. The lower range of detection
is approximately 12.5pg of male DNA in a 1:5000 male:female mixture.
For both PowerPlex Y and Profiler Plus™, the amplifications were successful using the real time qPCR data to calculate the volume to be added
to the PCR reactions. When run on the ABI Prism 310, the amplifications
resulted in peaks heights within the laboratory’s analysis parameters.
Additionally, the real time data proved to be a good indicator of the ratio of
male to female DNA. The Profiler Plus peak height ratios for the
male/female mixtures were reasonably consistent with the male to total
DNA ratios calculated from the qPCR data. These results were also similar
to the known male/female ratios in the actual dilutions.
From these data and data from the previous validations of Profiler
Plus™, COfiler™, and PowerPlex Y, it is possible to draw important
conclusions regarding mixed samples prior to STR amplification. Because
this assay can accurately detect male DNA in the presence of overwhelming amounts of female DNA, it is possible to decide how much
sample to use for PowerPlex Y amplifications. In addition, since the
assay can reasonably determine the ratio of male to female DNA in a mixed
sample, it is possible to reasonably deduce which samples will result in a
useful secondary male profile when amplified for Profiler Plus™.
DNA Quantitation, Real-Time PCR, Y STRs
B139 Development of Human and Human
Male DNA Quantitation Systems Using
a Novel, Fluorescent, Two-Primer
Real-Time PCR Method
Benjamin E. Krenke, MS*, Susan Frackman, PhD, Katharine
Hoffmann, BS, Gary Madsen, PhD, Cynthia J. Sprecher, BS, and Douglas
Storts, PhD, Promega Corporation, 2800 Woods Hollow Road, Madison,
WI 53711
The goal of this presentation is to present information on a new
approach to DNA quantitation.
by demonstrating a new commercial alternative for real-time PCR.
Heavily multiplexed Short Tandem Repeat (STR) analysis has
become the dominant technology in DNA-based human identification.
Although highly informative, these assays require a defined range of template quantity to produce optimal results. Additionally, resources can be
conserved with accurate assessment of DNA quality and assessment of
minimum quantity.
Currently, many practitioners observe either high levels of false
negative results (due to lack of sensitivity) or subjective conclusions (due
* Presenting Author
to visual comparison of band intensities) based on common hybridizationbased methodologies. Amplification-based methods for quantitation
provide a high level of sensitivity while real-time methods can deliver a
dynamic range that often exceeds end point assays. A numerical output
also increases the objectivity of the data interpretation.
A real-time PCR method has been developed for the quantitation of total
human and human male DNA in purified samples using the specificity of
interaction between two modified nucleotides to achieve quantitative PCR
analysis. One of the PCR primers includes a modified nucleotide (iso-dC)
adjacent to a fluorescent label on the 5´ end. The second PCR primer is unlabeled. The reaction mix includes deoxynucleotides and iso-dGTP, which has
been modified to include dabcyl quencher. The only nucleotide incorporated
at the position complimentary to iso-dCTP is dabcyl iso-dGTP. The incorporation of the dabcyl iso-dGTP adjacent to the fluorescent dye results in a
reduction in signal that allows quantitation during amplification. Associated
analysis software has been developed to visualize amplification data from
various instrument platforms, plot standard curves and calculate DNA concentrations of unknowns. Relative to other real-time approaches, this
methodology provides specificity through the use of fluorescently-labeled
primers compared to DNA binding dyes and simplicity compared to probebased quantitative PCR approaches. Data will be presented demonstrating
the performance of assays using human autosomal (total human) and human
Y-chromosome (male human) targets for quantitation.
Forensic Science, DNA Quantitation, Real-Time PCR
B140 Utility of Quantifiler™ Y in
Resolving Difficult Forensic Cases
Huma Nasir, BS*, Gina Pineda, MS, Brekeitrea Minyon Jones, MS,
Elaine Schneida, BS, Sarah Corrigan, MS, Sudhir K. Sinha, PhD, and
Jaiprakash G. Shewale, PhD, ReliaGene Technologies, Inc., 5525 Mounes
Street, Suite 101, New Orleans, LA 70123
community the usefulness of Quantifiler™ Y in forensic casework.
by demonstrating the usefulness of Quantifiler™ Y in forensic casework.
Quantitation of human male DNA and obtaining interpretable male
profile are major obstacles during the analysis of a mixture sample containing male and female DNA. Availability of Quantifiler™ Y for quantitation of human male DNA and Y-STR multiplex systems for amplification
of short tandem repeat loci on the Y-chromosome (Y-STRs) enables one to
overcome these obstacles. It is possible to quantitate male DNA and obtain
an exclusive profile of male DNA in a sample containing mixtures of male
and female DNA using Quantifiler™ Y and Y-STR multiplex systems,
respectively. Scientific Working Group on DNA Analysis Methods
(SWGDAM) has identified a set of eleven loci namely DYS19,
DYS385a/b, DYS389I, DYS389II, DYS390, DYS391, DYS392, DYS393,
DYS438, and DYS439 for forensic analysis.
Quantifiler™ Y human male DNA quantitation kit was validated for
forensic DNA analysis using the 7500 Sequence Detection System.
Analysis for Y-STRs was performed using the Y-PLEX™ 12 system. A
combination of Quantifiler™ Y and Y-PLEX™ 12 was used to obtain male
profiles in the analysis of 10 forensic cases. Sensitivity of the Quantifiler™
Y on the 7500 Sequence Detection System in the laboratory was 44.5 pg of
human male DNA. Quantitation of male DNA by Quantifiler™ Y is based
on real time PCR and hence provides scalable information about the quantifiable human male DNA. This approach enables one to obtain male
profile from evidence samples. Of the 15 cases investigated, 4 evidence
samples provided complete profiles, 2 evidence samples provided partial
profiles, and 4 evidence samples provided inconclusive results. Data and
strategies used for amplification of evidence samples from these difficult
forensic cases will be presented.
 Y, Y-PLEX 12, Forensic Casework
Quantifiler
103
B141 We’re Not Gonna Take It! Girls Fight
Back Against Attackers (Case Studies)
Noelle J. Umback, PhD*, Louis M. Serico, BS, Ana T. Fernandez, BS,
and Mary Quigg, BS, New York City Office of Chief Medical Examiner,
Department of Forensic Biology, 520 First Avenue, New York, NY 10016
The goal of this presentation is to present several interesting case
studies where in each case, DNA from the assailant was obtained after the
victim fought back. To date, CODIS has solved two of these cases.
humanity by demonstrating that semen on body swabs need not be the only
target for DNA analysis in rape cases. Women who defend themselves
during an attack help forensic laboratories by giving them more chances to
obtain male profiles from the available evidence.
Several recent male-on-female assault cases received for DNA
analysis by the New York City OCME Forensic Biology Department have
generated CODIS-eligible profiles. Three are from blood, one is from skin
cells, and one is from semen. These were all “stranger” rape or attempted
rape cases, in different NYC boroughs.
The first case of the “pattern” was a home-invasion in which a
stranger entered the bedroom of a middle-aged woman during the night,
and chased her around her room several minutes in her nightgown. The
sexual assault kit was negative, as expected because the attacker never got
the chance to complete the rape. She managed to hit him over the head with
a chair, drawing blood. Stains on the chest area of her nightgown matched
a crime-scene sample collected from the bedroom. The blood proved to be
male and was uploaded into CODIS. To date, no hits have surfaced.
Another home invader got more than he bargained for when his rape
victim managed to get a knife and stab him. No sexual assault kit was collected. There was one semen stain on a washcloth, which yielded no DNA.
There were bloodstains on several items from in and around the home, most
of which matched the victim. However, drops of blood collected from a
nearby sidewalk gave a clean male profile, which was uploaded into
CODIS. It hit a convicted offender immediately, making Special Victims
Unit detectives very happy, as this crime was one of a string (although the
first with DNA evidence) of violent attacks. The suspect was apprehended
within 24 hours.
A teenage girl was grabbed from behind in the elevator of her own
building by a man who told her he had a gun, and pulled her pants down.
The attack was recorded by a security camera but the picture was too blurry
to be of much assistance in identifying the man. During the struggle in
which she was injured as well, she managed to pull the much-larger perpetrator down the stairs with her, knocking off his eyeglasses; and eventually
escape into her apartment. Male DNA from the eyeglasses, as well as bloodstains in the case, gave a full CODIS profile; to date this case is unsolved.
A woman walking home late on a winter night was grabbed from
behind and dragged into a nearby park by a man with a gun. Following
completion of the forced sexual activity, the victim kicked him in the groin
and sprayed him with pepper spray. Detectives collected a semen sample
from the scene which yielded a full CODIS profile. This case has not yet
been solved.
Last but not least, a woman fended off a rapist in Central Park by
twisting the attacker’s penis in her hand when he put it near her face.
Meanwhile her dog bit him hard enough to draw blood, which left a stain
on her clothing. The male DNA from this bloodstain hit a convicted
offender sample in CODIS in the next search after its upload. At the time
he was free on parole.
Self-Defense, CODIS, Sexual Assault
B142 Developmental Validation of a New 17-Y-STR
Multiplex System: The AmpFlSTR®
Yfiler™ PCR Amplification Kit
Lori K. Hennessy, PhD*, Julio J. Mulero, PhD, Chien-Wei Chang, PhD,
Robert L. Green, BS, Yixin Li, PhD, Rixun Fang, PhD, Lisa Calandro, MPH,
and Cherisse Boland, BS, Applied Biosystems, 850 Lincoln Centre Drive,
After attending this presentation, attendees will learn about the
validation of a new Y-STR muliplex PCR assay.
by providing a new tool available for DNA testing of the
Y chromosome.
The goal of this presentation is to summarize the results of the
developmental validations studies for the AmpFlSTR Yfiler PCR
Amplification Kit. This kit was developed in accordance with the guidelines
of the forensic community, as defined by SWGDAM and the DNAAdvisory
Board’s (DAB) Quality Assurance Standards.
Analysis of DNA sequence variation on the Y chromosome has become
an increasingly important method in forensic casework, especially in sexual
assault samples where there is a relatively small amount of male DNA and a
large amount of female DNA. A multiplex PCR amplification system targeting Y-specific loci can simplify interpretation of complex male/female
mixtures and yield a high degree of confidence that only the male contributor(s) is being analyzed.
The authors have developed and validated a 17-locus Y-STR multiplex
system that has a higher discriminatory capacity than the European minimal
haplotype. The Y-STR multiplex includes all the loci in the “European
minimal haplotypes;” DYS19, DYS385, DYS389I, DYS389II, DYS390,
DYS391, DYS392, DYS393, the SWGDAM recommended Y-STR loci;
DYS438, DYS439, and six highly polymorphic loci; DYS437, DYS448,
DYS456, DYS458, DYS635 (Y GATA C4), and Y GATA H4. By incorporating the automated 5-dye DNA fragment analysis technology and nonnucleotide linkers small amplicon sizes (100bp-326bp) can be maintained
and ensure no overlap between allele ranges. 6-FAM™ labeled primers
detects DYS456, DYS389I/II, and DYS390. VIC® labeled primers detects
DYS458, DYS19, and DYS385 a/b. NED™ labeled primers detect DYS393,
DYS391, DYS439, DYS635, (Y GATA C4), and DYS392. PET® labeled
primers detect Y GATA H4, DYS437, DYS438, and DYS448. The fifth dye,
LIZ® is used to label the GeneScan-500 Size Standard. All loci are coamplified simultaneously in a single tube and analyzed in a single capillary
injection. The Yfiler™ kit includes an extensive allelic ladder containing the
most common 137 variants observed at each locus.
To test the sensitivity of the multiplex male DNA was serially diluted
from 4 ng to 31 pg. Complete male profiles above a 50-rfu threshold were
reproducibly obtained at 125 pg. Partial to complete profiles could also be
obtained at 62.5 and 31 pg. Testing a panel of domestic and farm animals,
bacterial species, and female DNA, the kit demonstrated primate and male
specificity. No cross reactivity was seen with the various animal or bacterial
species and no reproducible peaks above 50-rfu were detected in the presence
of 500 ng of female DNA. Complete male profiles were reproducibly
obtained at 1000:1 female to male mixtures and the minor contributor was
reproducibly distinguishable in male-to-male mixture ratios of up to 10:1.
Haplotype concordance was 100% when tested with the NIST standard
SRM#2395 and 600 population samples. A database for this new 17 Y-STR
multiplex has been created for determining haplotype frequency using population samples from North American, European and Asian population groups.
The data are accessible via the internet for haplotype searches.
Results demonstrate that the AmpFlSTR Yfiler PCR Amplification
Kit is a sensitive, valid, and robust multiplex system for Y chromosome STR
analysis. The system can be used in conjunction with Applied Biosystems
Thermal Cyclers, and ABI PRISM Genetic Analyzers, and provides the
forensic scientist with a complete set of tools for Y chromosome analysis.
Multiplex PCR, Y Chromosome, STR
104
* Presenting Author
B143 Development of a Haplotype Database
for the AmpFlSTR® Yfiler™ PCR
Amplification Kit
Lisa M. Calandro, MPH*, Julio J. Mulero, PhD, Lori Hennessey, PhD,
Lucas Rix, Charles Lawrence, Maryam Norouzi, and Dennis Reeder, PhD
Applied Biosystems, 850 Lincoln Centre Drive, Foster City, CA 94404
Attendees will receive an overview of the development of a haplotype
population database for the AmpFlSTR® Yfiler™ PCR Ampliification Kit
and the web-based tool for searching the haplotype database.
humanity by informing the forensic community of a new tool for the
analysis of haplotypes obtained using the Yfiler™ PCR Amplification Kit.
This presentation will discuss the development of a haplotype population database for the AmpFlSTR® Yfiler™ PCR Amplification kit.
Attendees of the presentation will be provided with an overview of a webbased tool for searching the haplotype database. Statistical analyses of the
population database and the detection of microvariants will be discussed.
Analysis of sexual assault evidence using currently available autosomal amplification and typing systems is complicated by the inability to
obtain male DNA profiles in the context of high quantities of female DNA.
As a result, sexual assault evidence containing low numbers of spermatozoa or semen from azoospermic or vasectomized males may not be analyzed and, if analyzed, often does not yield male DNA profiles. Analysis of
male-specific DNA markers can provide evidence profiles that may have probative or exculpatory value in such cases. Y STR analysis has proven to be
a valuable tool for recovering information from evidence samples containing
marginal amounts of male DNA. Due to the genetically linked structure of
Y STR haplotypes, estimation of population frequencies for a particular haplotype requires analysis of population database samples using the complete
set of markers used to analyze the forensic evidence sample. The
AmpFlSTR Yfiler PCR Amplification kit may also be utilized for
paternity analysis in situations involving male offspring, providing an additional tool for discrimination that will complement autosomal STR analysis.
The AmpFlSTR Yfiler PCR Amplification kit features 17 male-specific DNA markers located on the Y chromosome. A small range of amplicon
sizes, from 100-326 base pairs, has been achieved by labeling the amplified
products with four fluorescent dyes, including 6-FAM, VIC, NED, and
PET. The selected markers include the European minimal haplotype consisting of DYS19, DYS389I/II, DYS390, DYS391, DY6S392, DYS393 and
DYS385a/b, the additional SWGDAM recommended loci, DYS438 and
DYS439, as well as six additional loci, DYS437, DYS448, DYS456,
DYS458, DYS635 (Y GATA C4), and Y GATA H4. The added loci significantly increase the discrimination potential of the Y haplotype. A haplotype
database was developed in order to provide a useful tool for estimating Y haplotype frequencies in a variety of ethnic groups.
Population samples from North American, European and Asian population groups were analyzed by various test site laboratories and compiled
on the basis of ethnic group. The data are accessible via the Internet for
haplotype searches. Features of the search tool include the ability to input
evidence profiles both singly and in batches via automatic upload from
Genotyper® software files. The tool is also compatible with data generated
using GeneMapper® ID v3.2 software. A manual input mode allows entry
of microvariant data resulting in the capability for all profiles to be searched
and reported. Search outputs provide estimated frequencies for individual
ethnic groups as well as for all population samples. Any haplotype matches
to the forensic unknown will also be shown. As is the case for mitochondrial DNA, haplotype frequencies are estimated by counting the number of
times the haplotype is seen in various populations. Therefore it is desirable
to increase the size of the haplotype database where possible. Periodic
updates to the database will reflect the ongoing analysis of additional population samples.
Y STRs, Haplotype, Database
* Presenting Author
B144 The Amelogenin Sex Test: The Missing Y?
Lim Eng Seng Simon, BS*, Health Sciences Authority, DNA Database
Laboratory, 7 Maxwell Road, MND Building Annex B, #05-04,
Singapore, 069111, Singapore; Syn Kiu-Choong Christopher, PhD,
Health Sciences Authority, DNA Profiling Laboratory, 11 Outram Road,
Singapore, 169078, Singapore; and Tan-Siew Wai Fun, MSME, Health
Sciences Authority, DNA Database Laboratory, 7 Maxwell Road, MND
Building Annex B, #05-04, Singapore, 069111, Singapore
The goal of this presentation is to present the forensic community rare
and interesting failures in the amelogenin sex test and to recommend
alternative Y-locus (i.e., SRY) marker be routinely included in any sex test
to avoid mistyping and for gender confirmation. In addition, more p-arm
Y-STRs should be included in Y-STRs multiplex design to accommodate
potentialy q-arm Y-chromosome deleted males.
The amelogenin sex test is well established as the marker of choice for
sex determination in forensic DNA typing work. This sex test is included
in commercially available DNA typing kits. This presentation will impact
the forensic community and/or humanity by highlighting two interesting
cases that demonstrate the failure of the amelogenin sex test. Alternative
Y-locus (i.e., SRY) marker should be routinely included in any sex test to
avoid mistyping and for gender confirmation. In addition, more p-arm
Y-STRs should be included in Y-STRs multiplex design to accommodate
potentialy q-arm Y-chromosome deleted males.
The oral presentation will highlight two interesting cases that demonstrate the failure of the amelogenin sex test:
Case I: a male convicted offender was typed as “asexual” by
AmpFlSTR® Identiflier™ DNA typing kit.
Case II: a paternity test involving a family of 4 persons, where one
of the 2 brothers showed a female genotype by AmpFlSTR® Profiler
Plus™.
In both cases, the cause of gender mis-identification using the
commercial available amelogenin sex test found in the DNA typing kit was
resolved using alternative amelogenin primers, sex determining region on
the Y chromosome (SRY) primers, and Reliagene Y-Plex™ 12.
In the first case, during routine DNA Database typing analysis, an
amelogenin null male was encountered. Both amelogenin specific X and
Y alleles was missing from his DNA profile, obtained using the
AmpFlSTR® Identiflier™ DNA typing kit. Alternative amelogenin
primers, which amplifies the X allele at 212 bp, and Y allele at 218 bp was
used to verify the gender. Amplification using the alternative amelogenin
primers, showed the presence of only the X allele. This indicates a point
mutation at the primer binding position at the amelogenin X allele, which
account for the failure in typing for the amelogenin X allele using the
Identifiler™ DNA typing kit. However, the amelogenin Y allele still
remain missing. The SRY gene amplification gave a positive result, which
is the correct sex test result. Using the Reliagene Y-Plex™ 12 DNA typing
kit, a complete Y-halpotype DNA profile was obtained. Results therefore,
suggest that a deletion of the amelogenin gene must have occurred along
the Y chromosome. In addition, a point mutation of the primer-binding site
of the X allele used in the Identifiler™ DNA typing kit caused the total
failure of the amelognin sex test, resulting in a null allele profile for the
amelogenin locus.
In the second case, a family of four, which includes the tested parents
and their two sons, were genotyped using the AmpFlSTR® Profiler Plus™
DNA typing kit and their biological parentage relationship was established.
Gender determination using the amelogenin sex test available in the DNA
typing kit was correct for all, except for the older son, whose Y allele was
missing from his DNA profile. Alternative amelogenin primers fail to
amplify the Y specific allele as well. However, with SRY typing, the older
brother was correct for his gender. Reliagene Y-Plex™ 12 was then used to
determine the Y-STRs profiles of the biological father and his two sons.
The Y-STRs haplotype of the biological father and his younger son was
found to be both complete and consistent with one another. For the older
105
son, only the Y-chromosomal STR marker DYS393 and the X allele of the
amelogenin locus were typed. The DYS393 allele was found to be consistent with that of his father and younger brother. The results, therefore
indicate that a deletion polymorphism possibly, spanning a major part of
the Y-chromosome from Yp11.31 on the short arm up to Yq11.221 on the
long arm has occurred. This deletion event, would explain his missing Y
allele from the amelogenin maker using the Profiler Plus™ DNA typing kit.
In addition, the inclusion of more Y-STRs on the p-arm of the Y chromosome for e.g. DYS453, DYS446 and DYS456 in Y-STRs multiplex
design should be considered. In this way, Y chromosome with deleted qarm can still allow discriminating Y-STRs information to be obtained.
Amelogenin, Gender Identification, Y-STRs
B145 Genotyping of Nuclear Loci From
Telogenic Hair Shafts Using mini-STRs
Michael D. Coble, PhD*, Peter M. Vallone, PhD, and John M. Butler,
PhD, National Institute of Standards and Technology, 100 Bureau Drive,
Mail Stop 8311, Gaithersburg, MD 20899-8311
After attending this presentation, attendees will learn an approach to
increasing the successful typing of nuclear DNA from telogenic hair
samples using miniSTRs for both CODIS and non-CODIS markers will be
described.
humanity by demonstrating how the successful typing of even a small
number of nuclear loci from shed hairs can greatly increase the forensic
discrimination of the sample compared to mtDNA testing alone, where a
significant number of common types are present in the population.
Forensic DNA analysts often perform short tandem repeat (STR)
typing on highly degraded biological material and then turn to mitochondrial DNA (mtDNA) testing, which is less variable but more likely to
obtain a result due to higher copy numbers in cells, if many or all of the
STRs fail. MtDNA typing of hair shafts is a particularly important application as shed hairs are commonly found as sources of evidence. Currently,
forensic hair comparisons of evidentiary and reference specimens are based
upon a set of morphological characteristics. These analyses tend to be subjective, relying on the experience and judgment of the examiner.1
A number of studies have demonstrated that successful analysis of
degraded DNA specimens from mass disasters or forensic evidence
improves with smaller sized polymerase chain reaction (PCR) products.2
By moving PCR primers closer to the STR repeat region, it is possible to
obtain fully concordant results to the commercial kits while improving
successful analysis of degraded DNA with smaller PCR products or
miniSTRs2. However, many of the CODIS core loci have large allele
ranges (e.g., D21S11 and FGA) that make it impossible to create small
PCR products. The authors are also going beyond the CODIS core loci and
examining a battery of new potential STR loci that can be made less than
100 bp in size and would therefore be helpful in testing highly degraded
DNA samples.3
Methods and Materials: Hairs were digested using either a standard
micro-tissue grinding protocol or a complete digestion protocol.4 DNA
template was purified with phenol/chloroform/water followed by microcon
concentration or via binding/elution using a Qiagen column. PCR reactions
using STR miniplex markers of CODIS markers (TH01, FGA, D18S51,
D16S539) along with the D2S1338 marker and Amelogenin were evaluated. An additional miniplex containing non-CODIS markers (D10S1248,
D14S1434, and D22S1045) was also evaluated.
Summary of Results: A set of two miniSTR multiplexes containing
CODIS and non-CODIS markers have been evaluated for their ability to
genotype degraded DNA. A number of the miniSTR markers were used to
successfully type nuclear DNA from hairs belonging to multiple individuals.
106
Conclusions: The selection of STR loci that have a narrow allele
range (e.g., less than 50 bp) and can be made smaller than 100 bp works
well with degraded DNA samples. The successful typing of even a small
number of nuclear loci from shed hairs can greatly increase the forensic
discrimination of the sample compared to mtDNA testing alone, where a
significant number of common types are present in the population.
References:
(1) Bisbing, R.E. (1982). The forensic identification and association of
human hair. in Forensic Science Handbook, R. Saferstein, ed. (New Jersey:
Prentice Hall Regents), pp. 184-221.
(2) Butler, J.M., Shen, Y., McCord, B.R. (2003) The development of
reduced size STR amplicons as tools for analysis of degraded DNA. J.
Forensic Sci., 48(5): 1054-1064.
(3) Coble, M.D. and Butler, J.M. (2004) Characterization of new miniSTR
loci to aid analysis of degraded DNA., submitted.
(4) Hellmann, A., Rohleder, U., Schmitter, H., Wittig, M. (2001) STR
typing of human telogen hairs – a new approach. Int. J. Legal Med., 114:
269-273.
Short Tandem Repeat DNA Typing, Degraded DNA, Reduced Size
PCR Products
B146 Optimized Extraction of Nuclear
DNA From Hair Shafts: Part 2
Sheila M. Estacio, MS*, Stacey Murnyak, BS*, Zoran Budimlija, MD, PhD,
and Mechthild Prinz, PhD, Office of Chief Medical Examiner, Department
of Forensic Biology, 520 First Avenue, New York, NY 10016
After attending this presentation, attendees will learn a method to
extract nuclear DNA from hair shafts (without roots) on both head and
pubic hairs
Traditionally, it is known that nuclear DNA from hair shafts is
minimal to non-existent in the absence of a root or adhering epithelial cells.
This method proves that nuclear DNA can be obtained from hair shafts.
This method can be implemented in forensic DNA labs equipped mainly
for STR DNA testing. It can also be used in labs also online for forensic
mtDNA testing to use in conjunction with the STR profile to increase the
statistics on the profile obtained whether it be for use in criminal cases or
for missing persons. The profile or profiles can then be uploaded to
CODIS.
This research initially began as work to test hair samples recovered
from the World Trade Center Disaster and the hair samples received as references provided by the families as well as direct reference hair samples
from the victims. The experiments during Part 1 explored decontamination
methods, application of various enzymes for digestion, enzyme concentrations, different volumes of incubation buffer, amplification strategies, and
varied run parameters on the ABI Prism 3100 Genetic Analyzer. Part 2
focuses on comparing two modified extraction protocols using Promega’s
DNA IQ versus a direct lysis extraction.
Head and pubic hairs were collected. The hairs were cut to ensure that
no roots were present. If the hairs were not cut, they were examined macroscopically and microscopically to ensure that no roots were present. The
hairs were washed using 5% Terg-a-zyme, 0.9% NaCl solution, and 100%
ethyl alcohol and air dried overnight. The dried head hair was milled into
a powder using the Spex Certi-Prep Freezer Mill and measured out in 20mg
amounts. The pubic hairs were washed in the same way and each cut to 2.5
cm in length. The pubic hairs were pooled together to 12.5 cm and 25 cm
lengths. The hairs were then incubated in 1.8 mg/ml Proteinase K, 0.25M
DTT, 0.5% SDS, and DNA IQ incubation buffer containing 10mM Tris (pH
8.0), 100mM NaCl, and 50mM EDTA overnight at 56°C. The volume of
incubation buffer varied depending on the type of hair sample-milled hair
or pubic hair strands. For the milled head hair, the supernatant was taken
and divided evenly between the optimized DNA IQ and direct lysis
* Presenting Author
extraction. For DNA IQ, the recommended amount of Resin was used
followed by a Microcon 100 cleanup. For the direct lysis extraction, the
extract was purified through either a Bio-Rad Micro Bio-Spin
Chromatography or a Centri-Sep column followed by a Microcon 100
clean-up.
The amount of DNA was quantified using a real-time PCR Alu-based
assay (Nicklas and Buel). Attempts at quantifying the amount of nuclear
DNA were initially done using the slot-blot method (Quantiblot). As
expected, no DNA was detected since the sensitivity of Quantiblot is insufficient to less than 150 picograms. The use of the real-time technology is
advantageous for quantifying the low level amount of nuclear DNA in the
hair shaft extraction, to detect if melanin is inhibiting amplification, to
check the “success” of the positive and negative controls, and also to
predict the success of STR amplification.
Results from head hair and pubic hair are compared as well as the
differences in the amount of DNA recovered from blond, brown, and black
colored hairs. Initial results for 20 mg of milled head hair show that naturally blond hair yields a stronger signal in real-time PCR than brown or
black colored hairs for both extraction methods. This further proves that
melanin can act as a PCR inhibitor. Comparing the two extraction methods,
the optimized DNA IQ protocol is generally more successful at “capturing”
about three times more the amount of DNA than by using the direct lysis
method. Initial STR data based on Promega’s PowerPlex® 16 show the
expected amount of DNA degradation with drop out of the larger loci.
Future work will discuss the results of the testing on pubic hair
strands, additional STR results using PowerPlex®16, and the viability of
the extract and success for mtDNA sequencing.
Hair Shafts, Extraction, Nuclear DNA
B147 Evaluation and Quantification of Nuclear
DNA From Human Telogen Hair
Kerry L. Opel, MA*, and Bruce R. McCord, PhD, Florida International
University, University Park Department of Chemistry and Biochemistry,
11200 Southwest 8th Street, Miami, FL 33199; and Erica L. Fleishaker*,
and Weston Garber, Ohio University, Department of Chemistry and
Biochemistry, 136 Clippinger Laboratories, Athens, OH 45701
After attending this presentation, attendees will be familiar with the
procedures utilized in the extraction, quantification and amplification of
nuclear DNA from single telogen hairs.
humanity by providing information on the practicality of extracting and
amplifying nuclear DNA from human telogen hair.
This paper presents data on the extraction and quantification of
nuclear DNA from naturally shed hairs such as those that would be present
at crime scenes. Additional goals of this project are: to determine the significance of exogenous DNA on hair; to evaluate method for the removal
of exogenous DNA from the hair; and to evaluate the state of degradation
of the DNA using real time PCR. The quantified DNA was amplified using
small amplicon STR kits (Miniplexes) and a commercial STR typing kit.
Many experiments have been published on the extraction and amplification of DNA from hair. While some success has been reported for
amplification of DNA from hair, accurate quantification of the extracted
DNA has been a problem. Before the use of real time PCR for quantification, DNA analysts have relied on methods which lack the sensitivity
required to detect the minute amounts of DNA found in hair. Therefore,
information on the actual amount of nuclear DNA that can be recovered
from hair is scarce. The use of real time PCR for quantification allows for
detection of DNA in the picogram range, and this method is suitable for a
study of the amount of DNA that can be recovered from telogen hairs. In
order to ensure that the DNA quantified comes from within the hair,
methods that can remove exogenous DNA must be utilized. The use of
differential extraction is a method that allows removal of epithelial cells
* Presenting Author
from the surface of hair, and also allows for the evaluation of the impact of
exogenous DNA through quantification of the recovered DNA and evaluation of contamination by amplification of the exogenous DNA.
Direct evaluation of the state of degradation of DNA can normally be
accomplished through agarose gel separation and ethidium bromide
staining. However, this method required microgram amounts of DNA.
When only picogram or nanogram amounts are recovered, real time PCR
can be used to determine the number of small and large fragments through
amplification with different primers. Comparison of the amounts of large
and small fragments will indicate if degradation is present in the sample.
When DNA recovered from hair is degraded, success of amplification
of the DNA using multiplex kits with large amplicons can be limited.
Instead, Miniplex kits specifically designed for use with degraded DNA can
be used as an alternative for such samples.
In this project, DNA was extracted from telogen hairs (3 cm in length)
from numerous volunteers. Eight to nine hairs from each individual were
extracted using a published protocol consisting of a calcium based
extraction buffer system with DTT, phenol chloroform separation, and
Microcon® YM-30 filtration. The extracted DNA was quantified by real
time PCR using the Corbett Rotor-Gene 3000, a 124 base pair Alu
amplicon, and SYBR Green I dye. In order to evaluate the amount of
exogenous DNA contamination, a differential extraction buffer without
DTT was used to remove epithelial cell DNA, and the DNA removed was
extracted, quantified, and amplified with the Miniplex kits. Samples with
the highest concentrations were concentrated further using Microcon®
filters. The concentrated extracts were quantified with two different sized
Alu primers (124 and 280 base pairs) and the quantification results were
compared to determine the state of degradation of the extracted DNA. The
concentrated extracts were then amplified with the Miniplex kits, and the
results of the quantification were compared to the profiles to determine the
effect of the degradation on genotyping.
The amount of DNA recovered from hair using this method varies
greatly, with a range of 1-90 pg/ L. The amount of exogenous DNA
present in hair also varies, and the exogenous DNA appears to have little
contamination from outside sources. DNA recovered from hair does show
degradation upon evaluation by real time PCR, but the DNA can be successfully amplified using reduced size STRs.
Nuclear DNA, Telogen Hair, Real Time PCR Quantification
B148 Applications of Visible and Near
Infrared Chemical Imaging to the
Analysis of Forensic Evidence
Gemma Payne, BSc, and Brian Reedy, PhD, University of Technology,
Australia; Chris Lennard, PhD*, Australian Federal Police, Forensic
Services, GPO Box 401, Canberra, 2601, Australia; David Exline, MSFS,
R.J. Lee Group, Inc., 350 Hochberg Road, Monroeville, PA 15146; Rebecca
Schuler, BSc, ChemImage Corporation, 7301 Penn Avenue, Pittsburgh, PA
15208; and Claude Roux, PhD, University of Technology, Sydney, Centre
for Forensic Science, PO Box 123, Broadway, NSW 2007, Australia
Attendees will gain an understanding of chemical imaging and the
general application of this new technology in the field of forensic science.
With technology continuously evolving, it is important to explore new
developments that may prove to be superior to techniques currently in use
in forensic laboratories. This presentation will impact the forensic
community and/or humanity by demonstrating how chemical imaging
offers a higher discriminating power and greater sensitivity compared to
conventional digital imaging.
This oral presentation will describe the theory of chemical imaging
and demonstrate how this emerging technology has enormous potential in
the forensic analysis of materials when compared to traditional digital
imaging techniques.
107
Chemical imaging combines molecular spectroscopy and digital
imaging, providing both spatial and spectral information of materials.
Light intensity is detected as a function of wavelength as in spectroscopy,
and is also detected as a function of location as in conventional imaging to
form a data set. The three-dimensional data set has a fully resolved image
at each individual wavelength and a full spectrum at each individual pixel.
Valuable information can then be extracted from the large data sets through
the utilization of specialized software designed for chemometric and image
analysis. Common processing tools include zero offset, normalization and
principal components analysis.
This promising technology has a wide variety of applications in many
scientific and industrial fields, one of which is in forensic science.
Chemical imaging offers many advantages for forensic science applications. Over a short analysis time, information on morphology, composition, structure and concentration can be obtained and displayed side-byside. It is also a non-destructive technique that utilizes well-accepted
microscopy and spectroscopy methods, with little or no sample preparation
required.
The liquid crystal tunable filter (LCTF), the basis of the chemical
imaging instruments considered here, is extremely advantageous as it
replaces the often numerous detection filters needed. The LCTF is able to
perform analysis with less than 1 nm increments, which greatly increases
the sensitivity capabilities of the analysis. The VIS/NIR ChemImage
‘Condor’ Macroscopic Chemical Imaging system, as used in this research,
consists of an electro-optical tunable filter system with a charged couple
device (CCD) camera on a macroscopic platform. The total spectral range
of the VIS/NIR Condor is from 400 nm to 1100 nm.
This research project is focused on establishing the potential for the
use of the VIS/NIR Condor for forensic evidence analysis with special
focus on the analysis of inks on questioned documents. Over 110 pens have
been sampled (specifically blue and black ballpoint and roller-ball pens).
Chemical imaging analysis using the VIS/NIR Condor was conducted on
inks deposited on white paper. Resulting data sets were then processed
using the software to distinguish between the different inks. Traditional
optical techniques currently in use for ink analysis were used to obtain
comparison data.
Other avenues of research include firearm propellant analysis, latent
fingerprint detection, and textile fiber comparison. Unfired and fired
firearm propellant was examined using the VIS/NIR Condor with the
objective of determining if fluorescence can be used for the detection and
identification of propellant grains. Latent fingerprints on porous and nonporous surfaces were examined before and after common reagent treatment
to establish if additional ridge detail could be detected using the chemical
imaging system. Red and black textile fibers were examined in transmittance, reflectance and fluorescence mode to ascertain if Chemical Imaging
produced superior discriminating powers compared to traditional
techniques.
All evidence types examined produced extremely promising results.
The chemical imaging technology was able to distinguish a greater number
of inks and fibers. Propellant grains on a target could be traced to the brand
that was used in the shooting. The VIS/NIR Condor proved to be an
advantage when examining latent fingerprints, especially weak marks or
marks on surfaces that produce highly luminescent backgrounds.
Untreated latent fingermark ridge detail could also be detected in some
cases.
This is an ongoing research project that will be expanded to include a
range of evidence categories to fully validate the technology. Initial results
show that chemical imaging has great potential in the analysis of forensic
evidence including questioned documents, firearm propellants, fingerprint
detection and textile fibers.
Chemical Imaging, Ink Analysis, Trace Evidence
108
B149 Combinatorial Optimization of the
Extraction of Dyes From Textile Fibers
Amy R. Stefan, BS*, Christopher R. Dockery, BS, Alexander A.
Nieuwland, PhD, Samantha N. Roberson, James E. Hendrix, PhD, and
Stephen L. Morgan, PhD, University of South Carolina, Department of
Chemistry and Biochemistry, 631 Sumter Street, Columbia, SC 29208;
and Mark L. Miller, PhD, FBI Laboratory, Counterterrorism and
Forensic Science Unit, FBI Academy, Quantico, VA 22135
The goal of this presentation is to report the development of automated procedures for the extraction of dyes from textile fibers and analysis
of dye extracts by spectroscopic methods for possible adaptation to forensic
casework.
humanity by demonstrating how optimization of extraction conditions can
provide the analyst with the maximum amount of dye, possibly providing
additional discrimination between forensic fiber evidence.
This presentation will report the use of a Beckman-Coulter BioMek®
2000 laboratory automation workstation to systematically investigate a
combinatorial approach to the development of micro-scale extraction techniques for a broad range of dye classes from a range of textile fiber types.
The laboratory workstation was programmed to extract dyes from small
fiber samples. The resulting extracts were used to quantitatively determine
the extraction efficiencies of different extraction solvents. Details of the
programming and extraction technology will be presented along with
experimental results, conclusions, and potential impact on forensic science.
Use of an automated workstation to extract dyes from fibers presents
several advantages. Both speed of analyses and sample throughput are
drastically increased versus manual extraction. In addition, the automated
workstation gives the ability to program combinatorial experiments for the
determination of the solvent mixtures that will provide the most efficient
extraction conditions possible for a given fiber-dye interaction. Extraction
efficiencies were quantitatively determined via designed combinatorial
experiments and generation of surface response models.
Knowledge of the chemistry of fibers and fiber dyes is important to
developing extraction techniques. Depending on the chemistries of the
dye-fiber interaction, dyes may be loosely associated with fibers (e.g.,
direct dyes), bound by salt linkages (e.g., acid dyes), covalently bound to
the fiber (e.g., reactive dyes), or simply dispersed as finely divided pigments in the fiber (e.g., disperse dyes). Dyes may also be applied during
melt spinning of thermoplastic fibers (e.g., pigment coloration of nylon,
polyolefins and polyester) or adhered to the fiber surface with adhesives
(e.g., pigment dyeing of bedding and apparel fabrics).
The following fiber/dye combinations have been successfully
extracted using automated extraction techniques: acid dyes on nylon, basic
dyes on acrylic, direct, vat, or reactive dyes on cotton, and disperse dyes on
polyester. Acid dyes usually contain sulfonic or carboxylic acid groups that
form salt linkages to the nylon. Basic dyes on acrylics, also called cationic
dyes, contain basic groups that form salt linkages to the acrylic. Cotton is
usually dyed using direct, vat, or reactive dyes. Direct dyes form hydrogen
bonds with the cellulose, and usually contain sulfonic or carboxylic acid
groups, rendering them soluble in water. Vat dyes, which are usually
quinone structures, are reduced to their water-soluble leuco form for application to the fibers, and re-oxidized to form insoluble pigments to improve
wash fastness. Reactive dyes contain functional groups that form covalent
bonds to the cellulosic hydroxyl groups. Lastly, disperse dyes on polyester
are finely divided organic pigments dispersed throughout the fiber.
Dyes were extracted from fibers using the automated workstation, and
loaded into a 96-well plate system. In this 96-well plate system, each well
contains a 500- L glass insert. A Teflon liner was placed between the glass
inserts and a plastic lid to minimize evaporation of the extraction solvent
during high-temperature extractions. To further minimize evaporation of
solvents during extraction, the assembled plate was clamped in an alu-
* Presenting Author
minum press to improve the seal between the Teflon liner and the glass
inserts. Extracted dyes were analyzed by capillary electrophoresis (CE)
with a PACE-MDQ CE system using diode array detection. Optimization
of extraction conditions provides the analyst with the maximum amount of
dye, possibly providing additional discrimination between forensic fiber
evidence.
extraction and further analysis may only be considered if additional
discrimination is needed after forensic microspectroscopy and microspectrophotometry has been conducted.
Discrimination of Fiber Dyes, Capillary Electrophoresis, Mass
Spectrometry
Textile Fibers, Dyes, Automated Extraction
B150 Capillary Electrophoresis/Diode Array
Detection/Mass Spectrometry for the
Forensic Analysis of Fiber Dyes
B151 UV-Visible and Fluorescence
Microspectrophotometry for the
Forensic Analysis of Fluorescent
Brighteners on Textile Fibers
Alexander A. Nieuwland, PhD*, Brandi L. Clelland, BS, James E.
Hendrix, PhD, and Stephen L. Morgan, PhD, University of South
Carolina, Department of Chemistry and Biochemistry, 631 Sumter Street,
Columbia, SC 29208; and Mark L. Miller, PhD, FBI Laboratory,
Counterterrorism and Forensic Science Unit, FBI Academy, Quantico,
VA 22135
Stephen L. Morgan, PhD*, Alexander A. Nieuwland, PhD, Elizabeth M.
Enlow, BS, and James E. Hendrix, PhD, University of South Carolina,
Department of Chemistry And Biochemistry, 631 Sumter Street,
Columbia, SC 29208; and Edward G. Bartick, PhD, FBI Laboratory,
Coutnerterrorism and Forensic Science Research Unit, FBI Academy,
Quantico, VA 22135
The goal of this presentation is to determine the usefulness of capillary
electrophoresis-diode array detection-mass spectrometry (CE-DAD-MS)
on extracted fiber dyes for forensic fiber discrimination.
humanity by demonstrating CE-DAD-MS of extracted fiber dyes
represents a supplement to microscopy and microspectrophotometry for the
forensic discrimination of fibers.
Fiber evidence is frequently used in forensic science to associate a
suspect to a victim or crime scene. At times “questioned” fibers are
collected from the crime scene and “known” fibers are collected from
suspects for comparison. Evidence fibers are collected through a combination of picking, scraping, vacuuming, and sometimes taping clothing and
areas of the crime scene. They are often mounted in a mounting material
on microscope slides for comparison and storage. Once the fibers have
been collected, questioned and known fibers are compared using a series of
microscopic techniques to determine whether or not the fibers could have
come from the same source. The first of these methods is often polarized
light microscopy (PLM). Using PLM, the generic fiber type (polyester,
acrylic, nylon, cotton, etc.) is determined, and color, fiber cross-sectional
shape and fiber thickness are compared. This analysis is often followed by
fluorescence microscopy and UV-Vis and fluorescence microspectrophotometry. If spectra of the known and questioned fibers are consistent, the
hypothesis that the fibers originate from a common source should not be
rejected. Additional discrimination may be achieved by extraction of the
fibers dyes followed by chromatographic analysis. CE-DAD-MS was
chosen as the analysis technique following extraction because of its high
sensitivity and selectivity.
Fiber dyes were extracted using a Beckman-Coulter Biomek 2000
liquid sample-handling robot. Extracted dyes were analyzed using a
Beckman-Coulter P/ACE MDQ capillary electrophoresis system coupled
to a Micromass Q-TOF micro mass spectrometer. An external fiber optic
light source with a xenon lamp was used as the light source for the diode
array detector to enable simultaneous DAD and MS detection. This setup
provides an improved signal to noise ratio in the visible region and a better
agreement between peaks in the DAD and MS electropherograms.
CE-DAD of small molecules has often employed sodium acetate or
phosphate buffers with cationic surfactants or cyclodextrins as buffer additives. However, because of the requirements of the electrospray ionization
process, non-volatile buffers and buffer additives should be avoided in CEMS. CE-DAD-MS methods for the analysis of cationic dyes from acrylics,
direct, vat, and reactive dyes from cotton, acid dyes from nylons, and disperse dyes from polyester were developed.
Overall, CE-DAD-MS of extracted fiber dyes represents an alternative approach for the forensic discrimination of fibers. However,
because of the comparatively high cost and time requirements of CE/MS,
The goal of this presentation is to determine the usefulness of UV-Vis
and fluorescence microspectrophotometry of fluorescent brighteners on
fibers for forensic fiber discrimination.
humanity by demonstrating how fluorescent brighteners can be important
for discriminating among seemingly similar white fibers. The absorbance
and fluorescence of fluorescent brighteners on acrylic, cotton, nylon and
polyester fibers can be detected and differentiated in Permount without
significant interference from absorbance or fluorescence from the
mounting material. C Different fluorescent brighteners from the same
chemical subclass (e.g., pyrazolines) showed similar spectra that could also
be differentiated.
Fiber evidence is frequently used in forensic science to associate a
suspect to a victim or crime scene. “Questioned” fibers are collected from
the crime scene and “known” fibers are collected from the suspect.
Evidence fibers are collected through a combination of picking, scraping,
vacuuming, and sometimes taping clothing and areas of the crime scene
and are mounted in a mounting material on microscope slides for comparison and storage. Once the fibers have been collected, questioned and
known fibers are compared using a series of microscopic techniques to
determine whether or not the fibers could have come from the same source.
The first of these methods is often polarized light microscopy (PLM).
Using PLM, the generic fiber type (polyester, acrylic, nylon, cotton, etc.) is
determined, and color, fiber cross-sectional shape and fiber thickness are
compared. This analysis is often followed by fluorescence microscopy, and
UV-Vis and fluorescence microspectrophotometry. If spectra of the known
and questioned fibers match, the hypothesis that the fibers originate from a
common source should not be rejected.
Many fibers not only contain dyes that absorb visible light (400-700
nm), but also optical brighteners, which absorb ultra-violet light (around
360 nm) and re-emit light as fluorescence within the visible spectrum
(around 440 nm). These fluorescent dyes mask “yellowness” and can make
fabrics appear “whiter than white.” Most of the attention in the analytical
literature has been focused on fluorescent brighteners from detergents, with
little attention being paid to fluorescent brighteners applied by the textile
dyer. Fluorescent brighteners are often the only dyes present on white
fibers. They are added to the melt during manufacture of staple polyester
for blending with cotton. Textile dyers add fluorescent brighteners to
impart whiteness to woven and knit products. Everyone who launders
his/her clothing also adds fluorescent brighteners because they are in
almost every brand of laundry detergent.
Fluorescent brighteners can therefore be important for discriminating
among seemingly similar fibers. For this paper, nine different fluorescent
brighteners from six different chemical subclasses were compared: one
coumarin, two distyrylbiphenyls, one heterocycle, two pyrazolines, two
* Presenting Author
109
stilbenes, and one thiophene oxazole. One objective of this study was to
determine whether Permount®, a popular mounting medium for UV/vis
spectrophotometric characterization, would result in loss of discriminatory
spectral data for fibers dyed with fluorescent brighteners. To answer this
question, slides of polyester, acrylic and nylon 6 fibers, with and without
fluorescent brightener, were prepared using Permount and glycerin as
mounting media on glass and quartz. Additionally, the possibility of
discriminating between seemingly similar white fibers with different fluorescent brighteners based on their UV-Vis and fluorescence spectra was
assessed.
The absorbance and fluorescence of fluorescent brighteners on
acrylic, cotton, nylon and polyester fibers can be detected in Permount
without significant interference from absorbance or fluorescence from the
mounting material. Comparison of fluorescence spectra by visual analysis
and multivariate data analysis showed that fluorescence microspectroscopy
could differentiate between all 9 different fluorescent brighteners used in
this study. Different fluorescent brighteners from the same chemical subclass (e.g., pyrazolines) showed similar spectra that could nevertheless still
be differentiated. In the case of cotton and nylon, fluorescent brighteners
from detergents may increase the discrimination. Fluorescent brighteners
contained in the detergent tested, however, did not show substantivity for
polyester and acrylic fibers.
Overall, UV-Vis and UV-fluorescence microspectroscopy using
Permount is a viable approach for forensic discrimination of white fibers.
For best results, forensic investigators should use as thin a layer of
Permount as possible, and routinely take the 365 nm excitation fluorescence spectra of white fibers that show an absorbance peak around 360 nm.
Further discrimination may be achieved by extraction of fluorescent brighteners from fibers dyes followed by chromatographic analysis.
chemically react with the dyed fiber, be relatively easy to use, adhere and
harden rapidly for permanent storage (if desired), have high optical clarity
with no formation of bubbles or crystals, have a refractive index near 1.5
for performing polarized light microscopy (PLM), be soluble in a non-toxic
solvent to facilitate recovery of the fiber from the medium, be colorless, be
non-fluorescent, not yellow or shrink with age, and be inexpensive. While
no mountant possesses all of these ideal properties, a suitable mountant
must have most of these characteristics, and of particular importance is that
it must not react with the textile fiber. The authors have evaluated three
different mounting media (glycerin, Norland Optical Adhesive 65, and
Permount®) for the forensic discrimination of fibers by UV-VIS and
UV/fluorescence. Subject to a few working recommendations, it has been
found that Permount to be a suitable mountant for analyses.
A physical database containing over 500 dyed and undyed textile
fibers has been developed with contributions from textile companies in the
southeastern United States. All fibers have been characterized by polarized
light microscopy, UV/Visible, and fluorescence microspectroscopy. A total
of 25,000 UV-vis and fluorescence spectra have been acquired. Visual
comparisons among the fiber spectra from the database have been supplemented by multivariate statistical analysis to confirm the statistical validity
of discrimination observed.
Overall, UV/Vis and fluorescence microspectrophotometry are
valuable tools for the discrimination of fibers, in particular for discrimination of fibers of similar color but different dye composition. The fibers
and associated spectra in the database are a useful tool for fiber comparisons in casework and in quality control and training of analysts.
Recommendations will be made for approaches which produce the most
discriminating data to ensure that the limited time and resources available
in forensic laboratories are most efficiently applied.
Fibers, Fluorescent Brighteners, UV-Vis/Fluorescence
Microspectrophotometry
Fibers, UV-Visible Microspectrophotometry, Fluorescence
B152 Forensic Discrimination of Dyed
Textile Fibers Using UV-Vis and
Fluorescence Microspectrophotometry
Stephen L. Morgan, PhD, Alexander A. Nieuwland, PhD, Christopher R.
Mubarak, PhD, James E. Hendrix, PhD, Elizabeth M. Enlow, BS, and
Bryan J. Vasser, University of South Carolina, Department of Chemistry
and Biochemistry, 631 Sumter Street, Columbia, SC 29208; and Edward
G. Bartick, PhD*, FBI Laboratory, Counterterrorism and Forensic
Science Research Unit, FBI Academy, Quantico, VA 22135
The goal of this presentation is to evaluate the relative discriminating
power of visible, UV/visible, and UV/fluorescence spectrophotometry for
the characterization of dyed textile fibers.
humanity by demonstrating how UV/Vis and fluorescence microspectrophotometry are valuable tools for the discrimination of fibers, in
particular for discrimination of fibers of similar color but different dye
composition. The fibers and associated spectra in the database are a useful
tool for fiber comparisons in casework and in quality control and training
of analysts.
Fibers are ubiquitously found as trace evidence in crimes of personal
contact, such as homicide, assault, sexual offenses, and hit-and-run
accidents. Ultraviolet-visible (UV-VIS), and fluorescence microspectrophotometry (MSP) offers direct, relatively inexpensive, and informative
means of characterizing dyed textile fibers. Research in the use of UV-VIS
and fluorescence MSP has multiple objectives: improving the forensic discrimination of fibers by defining protocols for the most discriminating
approaches, validating data analysis methods, and providing a tested
database of spectra from dyed and undyed textile fibers.
Fiber samples for forensic microspectrophotometry are typically
mounted in a mounting medium (or mountant). The mountant must not
110
B153 A Study of Fabric Frequency
Robin T. Stoehr, BS*, and Max M. Houck, MA, West Virginia University,
Forensic Science Initiative, 886 Chestnut Ridge Road, PO Box 6216,
Attendees will learn an example of fiber content and frequency distribution among college students over time.
The majority of reported victims and offenders of sexual assault are
college aged, with the rape victimization highest among 16 – 19-year-olds.
In 2002, nearly 4,000 sexual assaults were reported on college campuses
nationwide. These crimes involve considerable contact between the perpetrator and the victim, allowing fibers to provide information about the crime
scene as well as the vehicle used to transport a victim. This presentation
will impact the forensic community and/or humanity by demonstrating data
from the current project that helps to answer questions such as which fibers
are more prevalent than others? Which fibers are rare? Are these fibers
rare, or just not as common within this particular population? Population
studies provide forensic scientists with a basis for understanding and interpreting the evidence they analyze, especially as it varies across geography,
culture, and economic status.
This paper will present the work done at West Virginia University to
determine the relative frequencies of fiber types and content in a collegeaged cohort over time. The research was conducted throughout the month
of April 2004. On a voluntary basis, 60 students were asked to describe
their clothing three days a week. A variety of garment types (i.e., shirt,
sweater, t-shirt, jeans, pants, etc.) were available to choose from when
examining up to two top garments and one bottom garment. This excluded
outer garments, such as jackets, coats, or slickers. Using the Kelly system,
primary, secondary, and tertiary colors of each garment in addition to the
modifiers light and dark were recorded. The students were asked to record
the fiber type and respective percentage of each garment as reflected on the
garment label(s).
* Presenting Author
This data was compiled to observe the totality of each garment type,
primary, secondary, and tertiary colors, and fiber type and percentage. Out
of the 619 #1 upper garments, 347 were t-shirts; 541 or 87.4% stated cotton
as the primary fiber type. Polyester and acrylic were the two other major
fiber types with 6.0% and 2.4%, respectively. Color distribution was more
even with the most frequent being white throughout primary, secondary,
and tertiary colors. The #2 upper garments were also primarily t-shirts at
126 out of the 244 total shirts observed. The fabric distribution was nearly
the same as upper garment #1, with cotton being the most prevalent
followed by polyester and acrylic including a high frequency of white
shirts. The bottom garments showed 398 out of the 620 were blue jeans, or
denim. Primary fiber types show that cotton was 93.3% of the total fiber
type among bottom garments. Polyester comes in next with 4.2% of the
total primary fiber type. Blue was the most prevalent primary color of all
bottom garments.
White cotton is the primary fabric type among the sampled group of
college students; white cotton is often noted for its lack of specificity in
fiber examinations. Excluding white cotton, polyester and acrylic in a
variety of colors are the most prevalent. The frequency of fibers such as
acetate, linen, and lyocel are non-existent in upper garments. Linen does
not seem to be popular among the college students sampled. Fashion plays
a large role in the fiber and fabric choices of this demographic and this
influences the potential evidence available to forensic scientists whose
casework involves college students in a temperate climate.
Fiber Analysis, Fabric Content, Fiber Distribution
B154 The Instrumental Analysis of the Volatile
Organic Compounds Present in Human
Scent by SPME-GC/MS and the Evaluation
of Scent Preservation Methods
Allison M. Curran, BS*, José R. Almirall, PhD, Adee A. Schoon, PhD,
and Kenneth G. Furton, PhD, International Forensic Research Institute,
Florida International University, University Park, Miami, FL 33199
Attendee will learn about the commonalities and the differences in
human scent profiles across different individuals.
humanity by demonstrating the variability of human scent profiles and
allowing for the better utilization of human scent evidence as an investigative tool in criminal cases.
Human scent evidence and scent identification canines have become
more commonly used by the law enforcement community for investigative
purposes in recent years. Canines, Canis lupus var. familiaris, have demonstrated the ability to discriminate between individuals based on their odor.
For these identifications to be valid, the hypothesis about human scent is
that each person has a unique odor that is stable over time. Scientific
research into the ability of canines to distinguish between individuals based
on their scent supports this theory. The research presented here also supports the hypothesis of the uniqueness of human scent. Solid Phase Microextraction Gas Chromatography Mass Spectrometry (SPME-GC/MS) has
proven to be a viable method for the extraction, separation, and identification of the volatile compounds which comprise human scent and various
types of compounds have been identified, such as organic fatty acids,
alcohols, aldehydes, and ketones
* Presenting Author
The majority of the scientific research into human odor has been
conducted on sweat collected from the axillary (armpit) area and the feet by
the cosmetics industry. The production of human odor is a complicated
process which has yet to be fully understood. A number of factors make
the axillary region a good odor producing area in the human body: (1) the
contents of the apocrine gland secretions may serve as bacterial substrates;
(2) moisture is available from the eccrine glands; (3) there is a resident
population of bacteria to transform non-odorous substances to odorous
substances; and (4) the presence of axillary hair may aid in the dispersion
of the odor. The human body has 2-4 million sweat glands distributed over
its surface. Sweating is the process of releasing a fluid secretion on the
body’s surface in an effort to control temperature. The human axillary
(armpit) region is the area of the body where the largest collection of sweat
glands in both size and number are located. Apocrine, eccrine, and
sebaceous glands, which are the major glands responsible for the secretion
of “sweat,” are all present in the axillary region of the body.
Forensically, odor collected from the hand is also of great interest.
The use of detector dogs for “human scent lineups” has been utilized in
European countries, including the Netherlands, Poland, Russia, Belgium,
Germany, Denmark, and Hungary for decades. A “human scent lineup” is
an identification based on a canine matching the human scent collected
from a crime scene to a possible suspect. The process for conducting a
“human scent line-up” in the Netherlands begins when scent evidence is
collected at a crime scene, packaged, and preserved. When a suspect is
taken into custody he or she may be asked to submit to a “human scent
lineup.” The suspect then holds a metal bar in his hands for a period of
time, and this metal bar is collected. This metal bar from the suspect along
with metal bars that have been held by other individuals and collected at
random throughout the population are set up in a sterile room, where the
law enforcement certified canine is then exposed to the scent evidence, and
allowed to work the line-up of hand scented metal bars independently.
Scent identification indicates an association between the suspect and the
scent evidence. Canines performing “human scent line-ups” are utilizing
hand odor for their distinctions between individuals.
This paper discusses the use of SPME-GC/MS for the analysis of
scent samples collected from both the hand and armpit region of individuals
differing in age, sex, and race. The stability and reproducibility of an individual scent profile over time for the purpose of creating a baseline for
human odor will also be discussed. The common compounds determined
between individuals and their relative ratios across individuals will be presented along with some compounds that are uncommon. The analysis of
scent samples collected from identical twins living under the same environmental conditions and different environmental conditions will also be
presented and compared.
Various collection techniques for axillary scent and hand odor samples
will be discussed as well as the stability of these samples when stored at
room temperature. Sampling methods and mediums are also being investigated in an attempt to optimize the recovery and storage of human scent
from forensic specimens. Different absorber types, including both sterile
gauze and King’s Cotton, which is used by the Dutch National Police for
human scent collection, have been evaluated based on their ability to collect
human scent. Persistence/dissipation studies of human scent using SPMEGC/MS will also be presented evaluating variables such as light (UV, VIS)
and temperature effects.
Human Scent, Odor Profiles, SPME-GC/MS
111
B155 Identification of the Metal Residues
on the Death Related to the High
Voltage Spark Region by SEM-EDS
Abdi Ozaslan, MD, Istanbul University, Department of Forensic
Medicine, I.U. Adli Tip Anabilim Dali, Cerrahpasa, Istanbul, 34303,
Turkey; Ismail Cakir, PhD*, Council of Forensic Medicine, Ministry of
Justice, Adli Tip Kurumu Esekapi Cerrahpasa, Istanbul, 34246, Turkey;
H. Bulent Uner, PhD, Istanbul University, The Institute of Forensic
Humman Sen, MD, Council of Forensic Medicine, Ministry of Justice,
Turkey, Adli Tip Kurumu Esekapi Cerrahpasa, Istanbul, 34246, Turkey;
Salih Cengiz, PhD, Istanbul University, The Institute of Forensic
and Sermet Koc, MD, Istanbul University, Medical Faculty of
Cerrahpasa, I.U. Adli Tip Anabilim Dali, Cerrahpasa, Istanbul, 34303,
Turkey
Attendees will learn an easy method for SEM-EDS data from the area
of metallic particles which were originated from the evaporating conductor
contaminate the skin the arc-burns related to the high voltage.
humanity by demonstrating how SEM-EDS data from the area of metallic
particles which were originated from the evaporating conductor can contaminate the skin the arc-burns related to the high voltage.
High voltage electric energy wires, transformers, and the devices
which run with this kind of electricity, may cause serious damage and
death. It is the goal of this presentation to demonstrate this to those in
forensic medicine by showing the conductive evaporated metallic particles
existing on the arc-burn of the corpse using the scanning electron microscope-energy dispersive spectroscopy (SEM-EDS).
It was reported to authorities that somebody who entered a transformer building in Istanbul without permission died of an arc which was
formed by the high voltage within the building. The autopsy was performed in the Morgue Department of Council of Forensic Medicine,
Ministry of Justice. During the autopsy, samples were collected using
double-sided adhesive coated stubs from the surface of the skin lesions,
which was the result of the high voltage arc, by stub. The removed samples
were examined by SEM-EDS technique. The results were evaluated to
determine the origin of death.
It was concluded that the SEM-EDS data from the area of metallic particles originated from the evaporating conductor. Contaminating the skin,
arc-burns resulting from the high voltage, are important combined with
other close examinations to identify the cause and mechanism of death.
Electrical Arc Burnt, Scanning Electron Microscopy-Energy
Dispersive Spectroscopy, Metallic Particle
B156 Development of a Method to
Produce Lead Particle Patterns
Howard A. Harris, PhD, JD*, and Abbey Scott, MS, University of New
Haven, Forensic Science Program, 300 Boston Post Road, West Haven,
CT 06516
Attendees will learn how to make reproducible lead oxide particle patterns of know amounts of lead oxide on various substrates.
humanity by assisting individuals interested developing improved methods
of visualizing lead particle patterns and recovering GSR particles.
112
This research involves the development of a simple procedure to
produce lead particle patterns on paper or cloth that resemble those used to
estimate muzzle to target firing distances. Forensic examiners have long
used the patterns produced on the target by lead particles and burned and
partially burned smokeless powder particles to estimate the distance
between the muzzle of a firearm and the object through which the bullet
passed. Test patterns for evaluation of method variations were produced by
firing a weapon from different distances into a piece of filter paper or cloth.
This usually requires a trip to a firing range and produces rather variable
patterns due to inconsistencies in the amount of smoke and lead produce by
a weapon from shot to shot. In addition, it would be convenient to be able
to measure the efficiency of various gunshot residue (GSR) recovery
techniques. To be able to do valid comparisons it is necessary to be able to
control the amount of lead deposited on the substrate. This is virtually
impossible when producing patterns in the normal way at a firing range.
The authors have tried to develop a laboratory method for producing
patterns of fine lead oxide particles, similar to muzzle to target patterns, on
paper and cloth substrates. One can purchase very fine lead oxide powders
in the size range of GSR particles1. Suspending these particles in water,
similar to the molybdenum sulfite suspensions used for the fingerprint
reagent “small particle reagent”2, followed by delivering a known volume
of the solution to the target would allow the delivery of a known amount of
lead oxide to the target. A simple squirt gun can be used to produce fairly
tight patterns similar to those produced at several inches by most firearms.
To produce more diffuse patterns, similar to those observed from shots of
one foot or greater distances, a simple spray bottle can be used. By
weighing the squirt gun or spray bottle before and after a “squirt” one can
calculate the amount of liquid delivered to the target. By knowing the concentration of the lead oxide in the suspension one can calculate the amount
of lead being delivered to the target. Using varying concentrations of lead
oxide in the suspension allows control of the amount delivered over a fairly
large range.
Three different substrates were used- filter paper, Whatman 3MM,
Electrophoresis blotting pads S&S and white cotton cloth. It was found
that using an inexpensive squirt gun fairly reproducible patterns could be
generated by firing vertically down from a range of three to five feet. Using
a spray bottle a more diffuse pattern could be made spraying from six
inches to twelve inches in a horizontal direction. The patterns were visualized using the standard two step-sodium rhodizinate method3. As
expected the diameter of the pattern increased as the distance increased.
Similar patterns over a number of shots were reproduced. The patterns
produced at the same distances on all three substrates were very similar in
appearance.
By weighing the squirt gun filled with distilled water it was
determined that it deliver 0.40 g of water quite reproducibly. A lead stock
solution containing 15g of lead oxide in 500 ml. of water was prepared. It
was found that the patterns produced with this solution were too concentrated to resemble gunshot patterns. A working solution was prepared by
diluting ten ml. of the stock solution to one hundred ml. This working
solution was used to obtain patterns as indicated above and the patterns
were visualized with sodium rhodizinate.
This technique produced quite reproducible looking patterns the
spread and intensity of which could be conveniently varied as indicated
above.
1. Alfa Aesar Research Chemicals Iron Oxide -325 Mesh Powder
2. Advances in Fingerprint Technology, H.C. Lee & R.E. Geansslen, 2nd
Ed., CRC Press, Chapter 4 p 113-4
3. M.R. Bartsh, H.J. Korbus, & K.P. Wainwrght, J. Forensic Sciences
1996;41: 1046-1051
GSR, Sodium Rhodizinate, Muzzle-Target Distance
* Presenting Author
B157 Lead Isotopes in Gunshot Residues
Jurian A. Hoogewerff, PhD*, Institute of Food Research, Norwich
Research Park, Colney, Norwich, NR4 7UA, United Kingdom; and
Herman Miesbauer, Ing, Upper Austria State Government, Goethestrasse
86, Linz, A-4021, Austria
The goal of this presentation is to inform the forensic community
about the possible usefulness of using lead isotope ratio analysis in specific
cases.
Different from the absolute concentration of an element or
element/element ratios, radiogenic isotopic ratios from elements like lead
or strontium are not sensitive to production or manufacturing processes and
provided that no additional radiogenic isotope is added, the isotopic
signature from the source material is retained. Due to geological processes
on geological time scales most raw materials have developed identifiable
isotopic fingerprints. Especially the lead isotopes are unique because the
combination of three radiogenic isotopes (206Pb, 207Pb and 208Pb) and one
stable isotope (204Pb) allow the construction of several different isotope
ratio scatter diagrams which permit a very sensitive and discriminative
assessment of the possible different sources of the lead.
In a recent case the clothes of a murder suspect contained elevated
traces of lead, possibly from GSR from a shooting incident. The defense
argued that the lead contamination had been caused by exposure in a
technical workshop. Additionally the evidence material had been kept
under suboptimal conditions for several years that could not exclude
contamination. Preliminary trace element analysis indicated elevated concentrations of several metals including lead.
In this study the authors compared the lead isotopic composition of
two GSR sheets from the murder victim with fifteen samples taken from a
pullover of the suspect. The samples from the pullover were taken from the
front and the back and the two sleeves in order to evaluate any focus of
possible lead contamination from the GSR.
This study showed that three different sources contributed to the lead
found on the pullover but that none of these three sources agreed with the
composition of the GSR found on the sheets.
Lead Isotopes, Gunshot Residues, Isotope Analysis
B158 The FBI Laboratory’s Response to
Recommendations Regarding
Comparative Bullet Lead Analysis
Diana M. Wright, PhD*, and Marc A. LeBeau, MS, FBI Laboratory,
Chemistry Unit, Room 4220, Quantico, VA 22135
Attendees will learn the FBI Laboratory’s response to recommendations regarding the analysis, assessment, and significance of comparative
bullet lead examinations, which were offered in an independent report by
the National Research Council of the National Academies.
humanity by informing the forensic community of the FBI Laboratory’s
response to recommendations set forth in a report by the National Research
Council of the National Academies regarding comparative bullet lead
analysis and its interpretation.
Comparative bullet lead analysis is the physical and chemical
examination of lead bullets, fragments, or shot pellets. It is a non-routine
examination, in that, it is only performed on damaged specimens that are
unsuitable for direct comparison by a firearms examiner or in the absence
of a firearm for comparative projectile testing. The FBI Laboratory has
provided this examination for over 35 years in support of local and federal
investigations involving recovered ammunition.
Throughout the history of this examination, challenges have been
raised in court as to its validity, scientific merit, and probative value. As
* Presenting Author
each criticism has been raised, the FBI Laboratory has sought to address
these concerns through the use of publications and presentations at
scientific meetings. Not all of the challenges, however, have concerned the
scientific method employed. Questions regarding the significance of the
examinations have consistently been posed to courts, which have chosen to
allow the jury to decide the issue. Periodically, more comprehensive
Daubert and Frye challenges have also been presented to the court
regarding this examination. Comparative bullet lead analysis has successfully withstood each of these challenges.
The FBI Laboratory has always welcomed constructive assessments
of its scientific practices. The Scientific Working Group (SWG) program
has been an excellent forum to allow for spirited scientific discussions that
ultimately result in consensus documents to serve as sample protocols for
the community. Unfortunately, comparative bullet lead analysis is an
examination that is non-routine or non-existent in the FBI Laboratory’s
peer organizations at both the state and federal level. Trace element
analysis, in general, is still fairly non-routine for most laboratories. The
necessary consumption of a portion of the evidence, the cost to purchase
and maintain the requisite equipment, and the challenges associated with
deriving a meaningful conclusion from the quantitative analysis of the
composition of a mass– produced, man-made entity have all contributed to
a lack of other laboratories embracing the technology.
To provide an impartial assessment of the comparative bullet lead procedure, statistical analysis and subsequent testimonial assertions, the FBI
Laboratory commissioned a study by the National Research Council of the
National Academies as a means of addressing the challenges to this examination. The intent of this study was to obtain guidance as to what improvements might be necessary to continue to produce quality results that could
be appropriately presented to a non-technical audience. To that end, the
FBI Laboratory also requested that the NRC consider appropriate language
to convey the bullet manufacturing process, chemical analysis, statistical
assessments, and interpretative conclusions to a jury in a manner that was
both thorough and concise.
This presentation will summarize the committee’s recommendations
to the FBI Laboratory. The recommendations cover a very broad range of
topics including: the analytical protocol, the number of elements analyzed,
quality control and proficiency testing measures, statistical recommendations for interpretation of the results, report wording, testimony language,
and the use of phrases that the NRC committee developed to describe some
of the concepts presented to a jury during direct testimony. The FBI
Laboratory’s response to each suggestion will be described after presentation of the specific recommendation.
Bullet Lead Analysis, NRC Recommendations, Comparative
Examinations
B159 Using LA-ICP-MS at the
Netherlands Forensic Institute
Shirly Montero, PhD*, Maarten Hordijk, Jan de Koeijer, Wim Wiarda,
Ing, Peter de Joode, Ing, and Gerard van der Peijl, PhD, Netherlands
Forensic Institute, Postbus 24044, Den Haag, 2490AA, The Netherlands
Attendees will learn the discrimination potential of LA-ICP-MS for
the elemental analysis of different types of materials of forensic interest.
humanity by demonstrating the discrimination potential of LA-ICP-MS in
the analysis of chemical composition of some materials of forensic interest
that cannot be discriminated using traditional methods.
Trace evidence is widely recognized for its associative value.
Sometimes recovered samples associated with a suspect and samples
associated with a known source are compared to each other based on the
physical properties as well as their chemical composition. The choice of
methods to characterise and compare trace evidence depends on, among
other factors, the accessibility of the proper instrumentation (i.e., sensi113
tivity, discrimination potential), the cost of the analysis including analysis
time and the characteristics of the evidence (such as size and physical
state). However, when there is control on the variation of physical
properties in materials of the same kind, the discrimination potential of the
methods used to measure such properties decreases. In many of those
cases, elemental analysis has demonstrated to have a great value when used
for the characterisation of such materials. In addition, if the sample is
small, more sensitive methods are needed to measure reliably the elemental
composition, in particular at trace levels. In recent years, different research
laboratories and international networks have made an effort to develop and
validate analytical methods with better sensitivity, precision and reproducibility.
At the Netherlands Forensic Institute, different analytical methods
have been optimised and validated for the elemental analysis of materials
of forensic interest by LA-ICP-MS. Two of these materials, glass and
pigment-based ink on paper, have been selected for this presentation. There
are many studies demonstrating the value of elemental analysis of glass by
different techniques. On the other hand, the need for non-traditional
methods for the examination of documents produced with inkjet printers
(e.g., threatening letters, contracts, and invoices) has increased only
recently with the shifting from dye-based inks to pigment-based inks. Inks
belonging to the latter type, are more robust when exposed to light and
more resistant to solvents in contact with the paper, thus, not bleeding as
much as inks of the former type. However, pigment-based inks are not
soluble and therefore, not easily separated by traditional methods such as
TLC and HPLC. The improved quality in the manufacturing of printers
makes the differentiation among them based on physical characteristics
more difficult, whether from the same manufacturer or from different ones.
The technique, LA-ICP-MS, combines the sensitivity and precision of
ICP-MS with the advantages of laser ablation sampling. With the use of
LA-ICP-MS there is no need for laborious and lengthy digestion procedures with dangerous chemicals. In addition, the common analytical interferences that are increased by the presence of solvents are minimised using
laser sampling, improving the detection limits of some potentially discriminating elements. The amount of material ablated for the complete analysis
is very small (~fg), allowing the analysis (including replicates) of very
small samples. The destruction is minimal with craters in the order of
10-8 m2, in contrast to the solution approach where the whole sample to be
analysed is irreversibly digested. The system at the NFI is an ICP-MS
(Perkin Elmer ELAN DRC plus) in combination with a 3 mJ- 213 nm-laser
ablation system (New Wave UP-213).
The standard reference materials (SRMs) NIST 612 and 1830 were
used for the development and validation of a quantitative method for glass
analysis. This method has been used to analyse glass samples collected by
the police from different locations within the Netherlands. In addition, the
traditional analyses such as the refractive index measurements and the less
sensitive semi-quantitative µXRF measurements were carried out on all the
samples. The methods, the selection of the matching criteria and the results
of the comparisons of the samples using elemental concentrations and
refractive index (measured with GRIM II) will be discussed. Finally, the
development and validation and application of a semi quantitative method
for the analysis of pigment-based inkjet inks will be also discussed.
LA-ICP-MS, Elemental Analysis, Trace
B160 Characterization of Trace Elements in
Gunshot Residue of Lead Free Primers
Winchester, Winclean, and Remington
humanity by demonstrating a systematic analysis, of gun shot residue
(GSR) from primers and ammunitions in the area surrounding bullets holes
and from the shooter’s hand. This is a very important tool to determine the
shooting distance, types, of the primer and ammunitions to the forensic
scientist.
A comparative study of the gunshot residue particles produced during
firing bullets having lead free primers manufactured by Winchester,
Winclaen, and Remington were performed. Morphology and composition
were analyzed using scanning electron microscope equipped with energy
dispersive x-ray.
The effect of lead pollution caused by the use of bullets and primers
containing lead is one of the greatest problems facing the law enforcement
and the military. Therefore attempts have been in progress to eliminate lead
based primer mixtures and bullets. The recent development of lead free
ammunition and bullets represent a new challenge for ballistic specialists
and forensic scientist. Much research work has been carried out and published on lead based GSR but, only very few research studies have been
reported in the analysis gunshot residues produced from lead free primers
during firing.
In this context this research is a study of the topography, morphology,
and composition of the residues deposited during firing using lead free
primers and ammunitions. Attempts have also been given to detect and
estimate the amount of various constituents in the given ammunition and
also to correlate the results to forensic examination.
Test firing, collection of gunshot residues, and subsequent analysis
were carried out at the Forensic Science Laboratory of the Albany State
University. A specially made bullet trap filled with polymer fibers was
employed for live firing. The firearms used in this study were a Springfield
Armory 0.45 caliber (model 1911) and a Beretta 9mm Parabellum (model
92 FS.CaC). Two types of ammunition, 9 mm and 45 ACP, used in this
study were manufactured by Winchester (Win Clean) and Remington.
Firing distance and the area surrounding the target are the two parameters
used in the collection of gun shot residues. A total of 60 rounds were fired
in this study. Imaging and compositional analysis were performed on a
Cam Scan 44 scanning electron microscope equipped with energy dispersive x- ray detector.
Spherical and Non-spherical particles with size in the range 3- 30 m
are studied for intensity, distribution and composition of gun shot residue
particles. Intensity and distribution are studied as a function of shooting distance and collection areas. Number of particles on the shooter’s hand is
high, compared to those collected from different areas of the target. The
elements identified from the GSR particles of Winchester Winclean primers
are Potassium, Calcium, Aluminum, Chlorine, Sodium, Copper, Zinc, and
Silicon where as Remington constitutes Copper, Zinc, Magnesium,
Chlorine, and Silicon. Composition variations are based on the size and
shape of the GSR particles. Nonspherical and large particles always composed of more than three elements. Small and spherical particle contains
either one or two elements. Attempts have been made to distinguish
between Remington and Winchester Winclean GSR particles in terms of
composition and morphology.
Both types of GSR particles contain Copper and Zinc alone or in combination with other respective elements. This is because of the brass plated
cartridge or the brass firing pin. Lead and barium is also found in both
types due to use of previously fired gun. Morphology and size do not show
any differences in their intensity or distribution. Characteristic GSR particles having spherical, spherical with dimples, oval, and irregular shapes
are common in both types.
Gun Shot Residue, Scanning Electron Microscope, Lead Free
Primers
Zachariah Oommen, MSc, PhD*, Scott Pierce, and Odister Kisha, Albany
State University, 504 College Drive, Albany, GA 31705
Attendees will gain a comparative understanding of the gunshot
residue particles produced during firing bullets having lead free primers
manufactured by Winchester, Winclaen, and Remington.
114
* Presenting Author
B161 Detection of Recent Handling of Firearms
Joseph Almog, PhD*, The Hebrew University, Casali Institute of Applied
Chemistry, Jerusalem, 91904, Israel; Yaniv Avissar, MSc, The Hebrew
University, Analytical Chemistry Department, Jerusalem, 91904, Israel;
Assaf Sagiv, MSc, The Hebrew University, School of Pharmacy,
Jerusalem, 95744, Israel; and Daniel Mandler, PhD, The Hebrew
University, Analytical Chemistry Department, Jerusalem, 91904, Israel
Attendees will learn how to detect recent handling of firearms by a
simple and sensitive color test. The reasons for differences between
various individuals in the quality of the marks developed on their palms.
humanity by increasing the number of serious crimes, which are resolved
by scientific techniques.
Several physiological and environmental factors that affect the
outcome of the Ferrotrace technique have been thoroughly studied.
Consequently, two improvements, which greatly enhance sensitivity, have
been suggested.
Handling of a gun results in the formation of invisible impressions,
caused by transfer of iron traces to the skin surface. Visualization of these
impressions is possible by spraying the palms with a solution of 3-(2pyridyl)-5,6-diphenyl-1,2,4-triazine (PDT), which forms a magenta
complex with iron(II) residues.
Quantitative data are reported for the first time on the amounts of iron
transferred to the hand upon holding a firearm. Iron levels between 21–315
ng/cm2 were found on volunteers’ palms after a single holding of a
handgun. Determination of the iron traces was accomplished spectrophotometrically using PDT as a chelating agent. The transfer of iron from
firearms to the palm was found to be, by and large, a chemical (dissolution)
rather than mechanical dislodgement. The prime factor that determines the
amount of iron transferred from the firearm to the hand is the moisture level
on the palm. More factors, however, are involved in this process. Three
time-dependent factors have been studied with relation to their effect on the
developed mark: the gripping duration of the weapon; the time that elapses
from the moment of contact; and the rate of iron dissolution in aqueous
solutions containing sweat components in physiological concentrations.
It was found that the amounts of iron transferred to the palm depend
on both, the gripping period and the levels of palmar moisture. Thus, only
a few seconds of gripping were required for good marks to develop (corresponding to 80 ng.cm-2 of iron) on highly-moistured hands (“good
acceptors”). Much longer gripping periods were necessary for marks of
similar intensity to develop on relatively dry hands (“poor acceptors”).
Experiments aimed at studying the effect of sweat components on metallic
iron dissolution were carried out in aqueous solutions. It was found that
chloride ions in physiological concentrations remarkably enhanced the dissolution, while L-serine, the major amino acid in palmar sweat, had a detrimental effect on this process. These findings are likely to be of importance
in courts of law, as well as in the war against terrorism and serious crime.
Two modifications, which have been suggested − splitting the development process into two subsequent steps, and exposing the hand to water
vapor − greatly improve the sensitivity of the method.
Several cases that were resolved by the Ferrotrace reagent will be
demonstrated.
Forensic Science, Firearms, PDT
* Presenting Author
B162 A Portable X-Ray Fluorescence
Instrument for Forensic Investigations
Jeffrey Schweitzer, PhD*, University of Connecticut, Department of
Physics, Unit 3046, 2152 Hillside Road, Storrs, CT 06269-3046; Jacob
Trombka, PhD, and Samuel Floyd, NASA Goddard Space Flight Center,
Laboratory for Extratraterrestrial Physics, Greenbelt, MD 20851; Carl
M. Selavka, PhD*, Massachusetts State Police, Crime Laboratory System,
59 Horse Pond Road, Sudbury, MA 01507; Gerald Zeosky, MS, New York
State Police, Forensic Investigation Center, 1220 Washington Street,
Albany, NY 12226-3000; Norman Gahn, JD, Office of the District
Attorney, Milwaukee County, Milwaukee, WI 54040; and Timothy
McClanahan, BS, and Thomas Burbine, BS, NASA Goddard Space Flight
Center, Greenbelt, MD 20851
After attending this presentation, attendees will understand the critical
design features and operational parameters of a new, portable x-ray
instrument for assisting in the recognition of trace evidence for crime scene
and forensic laboratory applications.
humanity by describing the development of a portable x-ray fluorescence
instrument; demonstrating the operational performance of the instrument
for trace residua of forensic importance, including (but not limited to)
primer residue, blood, and semen in a simulated crime scene; and discussing the future use of this instrument at crime scenes or in the laboratory
to develop investigative leads by assisting in the recognition and recovery
of such trace evidence through elemental analysis.
A rugged x-ray fluorescence (XRF) instrument has been designed to
investigate trace element content in and on evidence at crime scenes. The
initial focus is to identify possible materials of interest such as gunshot
residue and bodily fluids, but it has broad capability for general XRF applications. The instrument was designed to be part of a system to aid crime
scene investigation and transmit the data to locations requiring it. This
portable instrument was designed to meet the constraints of weight, battery
operation, and ruggedness. Some special design features, however, were
needed to achieve detection of microgram quantities of the trace elements
of interest.
This instrument is part of a Teleforensics program jointly funded by
NIJ and NASA. This collaboration seeks to develop cost-effective instrumentation based on technology developed for the space program to benefit
crime scene investigation, and to develop advanced instrumentation for
planetary missions for NASA. A critical factor at crime scenes is the
collection of evidence for analysis at forensic laboratories. The friable
nature of evidence requires rapid recognition, to avoid losing the probative
information contained therein. Some evidence is invisible to normal investigation techniques, either because it involves trace quantities not visible to
any investigation technique, or because it is covered or hidden from view.
Many types of potential evidence can be indicated by crime scene detection
through in situ trace element analysis.
Data is shown that supports possible use of a portable XRF instrument
through detection of gunshot residue, blood (through the detection of the
iron in hemoglobin), and semen (through the detection of zinc protoporphorin). To detect the low levels of trace element concentrations, advanced
technology has been incorporated including the unique x-ray generator and
a recently developed Shottky cadmium telluride x-ray detector. The design
of the internal structure of the instrument is a critical component for minimizing the background due to coherent scattering. This design was necessary to ensure that the instrument could measure microgram quantities of
elements of interest. It was also necessary to select the x-ray tube anode
material to ensure that the tube’s x-ray line production does not interfere
with the detection of elements of forensic interest.
A key feature for the efficient and reliable operation of the instrument
is spectral analysis software that can adapt to changing backgrounds and
arbitrary elemental content. The results are incorporated in a database that
was originally developed for planetary missions. In addition, it is now
115
understood that the application of historically-derived XRF data loaded
into a relational database representing data relationships between items of
interest and background matrices is just as important in forensic applications as has been recognized for planetary missions. Discussion of the use
of such relational databases to assist in data recognition and recovery, and
those data related to forensic trace evidence either available or researched
to date, will also be included.
The authors have also helped develop a Monte Carlo code for modeling the interaction of x-rays from any inputted source and the secondary
particles that they produce as they interact with any type of material. This
code can simulate the x-ray fluorescence produced by a variety of forensic
materials (e.g., blood, semen, gunshot residue).
Finally, results of experiments to date characterize the expected performance of the instrument for detecting trace element concentrations that
are useful for investigating crime scenes and in laboratory applications.
Teleforensics, Trace Recognition & Recovery, Portable X-Ray
Fluorescence
B163 Evaluation of SNPs as Tools in
Human Identity Testing
Peter M. Vallone, PhD*, Amy E. Decker, BS, Michael D. Coble, PhD,
Margaret C. Kline, MS, and John M. Butler, PhD, National Institute of
Standards and Technology, 100 Bureau Drive, Gaithersburg, MD
20899-8311
After attending this presentation, attendees will learn the utility of
single nucleotide polymorphisms (SNPs) as human identity markers. The
attendee will learn about different classes of SNP markers, typing
technologies, and how SNPs compare with STR markers.
humanity by reporting on the utility of SNP markers to the DNA testing
community. SNP markers can provide valuable complementary roles in
human identity testing. The typing of coding region mtSNPs and small
autosomal panels of SNPs for typing degraded DNA are two examples of
where SNPs can benefit the forensic community.
SNPs have the potential to play a helpful role in human identification
testing. The small PCR amplicon sizes associated with SNP typing technologies make SNPs attractive for typing degraded DNA or other low copy
number situations. SNP can be useful in combination with STRs for
resolving complex paternity issues (e.g., incest), identifying victims of
mass disasters where insufficient family references are available and possibly inferring population of origin. SNPs located in the coding region of
the mitochondrial genome have been used to separate common HV1/HV2
mitotypes thereby extending the power of mtDNA testing (1,2). SNPs
located on the Y chromosome have been evaluated for ethnicity prediction
and individual sample discrimination (3).
Various SNP typing platforms exist, but at this time there is not a
universally agreed upon platform for SNPs and human identity testing.
Currently researchers are typing SNPs with multiplex allele specific primer
extension (ASPE) reactions. The assay is comprised of an initial step of
PCR followed by primer extension and subsequent fragment separation and
detection by capillary electrophoresis. ASPE multiplex panels can
routinely type 6-12 SNPs in a single tube and have reported to go as high
as 35 SNP markers.
Important considerations for SNP markers are the larger number
required to equal the discriminatory power compared to traditional STRs,
their inability to resolve complex mixtures, issues related to databasing new
loci, and the availability of a standard analysis platform. However, in
appropriate situations SNPs can be useful as a supplementary tool complementary to STR markers.
Methods and Materials: A total of 70 bi-allelic (C/T) SNP markers
have been typed for 189 U.S. samples. Amplifications were performed in
6-plex panels. Amplicons between 59 –108 base pairs were generated. The
116
SNP markers were typed using multiplex ASPE assays and capillary
electrophoresis. An 11-plex ASPE assay for typing coding region SNPs
that helps resolve the most common Caucasian mitotype was developed
and run on samples previously screened by Roche linear arrays for a
common HV1/HV2 mitotype. Multiplex assays consisting of 3 ASPE
multiplexes and 5 commercial hybridization multiplexes were used for
typing 50 Y-SNPs. The 50 Y-SNPs were typed for 229 U.S. African
American and Caucasian samples.
Summary of Results: Novel multiplex SNP assays have been
developed for typing various classes of SNP markers on U.S. population
samples. Subset panels of the 70 autosomal SNP markers have been used
to successfully type DNA from shed human hairs. Results for mtSNPs and
Y-SNPs allow for an evaluation of the practical utility of various SNP
markers in a human identity context. Samples typed by commercial and
novel multiplex STR panels allow for a direct comparison of SNP and STR
markers.
Conclusions: Practical and inherent characteristics of SNP markers
will prevent them from replacing traditional STR typing methods.
However, SNP markers can provide valuable complementary roles in
human identity testing. The typing of coding region mtSNPs and small
autosomal panels of SNPs for typing degraded DNA are two excellent
examples of where SNPs can benefit the forensic community.
References:
1. Coble, M.D., Just, R.S., O’Callaghan, J.E., Letmanyi, I.H., Peterson,
C.T., Irwin, J.A., Parsons, T.J. (2004) Single nucleotide polymorphisms
over the entire mtDNA genome that increase the power of forensic testing
in Caucasians. Int. J. Legal Med., 118: 137-146.
2. Vallone, P.M., Just, R.S., Coble, M.D., Butler, J.M., Parsons, T.J.
(2004) A multiplex allele-specific primer extension assay for forensically
informative SNPs distributed throughout the mitochondrial genome. Int. J.
Legal Med., 118: 147-157.
3. Vallone, P.M. and Butler, J.M. (2004) Y-SNP typing of U.S. African
American and Caucasian samples using allele-specific hybridization and
primer extension. J. Forensic Sci. 49(4): 723-732.
Single Nucleotide Polymorphism, Multiplex PCR, Degraded DNA
B164 Allele Drop Out at Locus D5S818
Caused by a Single Nucleotide
Polymorphism at a Primer Binding Site
Peter Bugert, Institute of Transfusion Medicine and Immunology,
Friedrich-Ebert Str.107, Mannheim, 68167, Germany; Lotte Henke, PhD*,
and Juergen Henke, PhD, Institut fuer Blutgruppenforschung,
Hohenzollernring 57, Cologne, 50501, Germany; and Harald Klueter, MD,
Institute of Transfusion Medicine and Immunology, Friedrich-Ebert
Str.107, Mannheim, 68167, Germany
After attending this presentation, attendees will understand the reason
for the loss of allele D5S818*10 when using PowerPlex®16 kit,
approaches to overcome this and similar problems, and the impact and consequences for data bases.
humanity by providing the forensic community with the knowledge of the
nature and the frequency of a primer binding site mutation and its impact
on multiplex PCR analyses. Moreover, information is provided how to
overcome the problem of allele drop out in general.
The goal of this presentation is to clarify the reason for loss of allele
*10 at locus D5S818 when using PowerPlex® 16 kit.
Outcome: The authors present data about a single nucleotide polymorphism (SNP) at STR locus D5S818 including association of the mutant
with the STR allele *10 and strategies to overcome the problem of allele
drop out.
Three SNPs were localized in close proximity to the D5S818 STR
region at positions –13 (C/T), +4 (G/T) and +36 (T/C). The reverse primer
* Presenting Author
for amplification of this locus in the PowerPlex® 16 kit binds in the region
of the +36T/C SNP. In order to investigate allele frequencies of the +36T/C
SNP the authors established an allele-specific PCR method using sequencespecific primers (PCR-SSP). The PCR-SSP method was used for genotyping 288 samples from a DNA archive of blood donors from Southwest
Germany. Four of the samples revealed a heterozygous genotype of the
+36T/C SNP, thus, the frequency of the +36C-allele was 0.69% in this population. According to the Hardy-Weinberg-Equilibrium the heterozygous
+36T/C genotype occurred at a frequency of 1.4%, whereas the
homozygous +36C/C type may be observed in 1:20,000 individuals only.
Sequence analysis of the D5S818 locus in the 4 individuals with the heterozygous +36T/C genotype demonstrated a linkage of the +36C-allele
with the STR allele *10 in all cases. In the multiplex STR-analysis using
PowerPlex® 16 kit the samples showed homozygous phenotypes at locus
D5S818. The same samples were investigated further using the same
primers for amplification of the D5S818 locus but in monoplex PCR. The
monoplex analysis revealed heterozygous genotypes for all samples with
unambigous amplification of allele *10 in addition to other alleles. In order
to solve the problem of allele drop out in multiplex STR analysis the
authors investigated the use of a PCR primer containing a wobble base at
the corresponding position of the +36T/C SNP. The standard reverse
primer for amplification of the D5S818 locus was replaced by the wobblebase primer in the multiplex assay. DNA samples with known STR- and
+36T/C SNP-types were analyzed by using the modified primer mix. The
STR allele *10 could be clearly detected even in samples with a heterozygous +36T/C genotype, indicating that the wobble primer is suitable
to overcome the problem of allele drop out. On the other hand the modified primer led to an increased background, i.e., higher numbers of unspecific amplification products. Modification of the PCR program should
overcome this problem. In cases of a homozygous D5S818 phenotype the
authors would suggest the use of one of the following strategies:
1) Decreasing the annealing temperature; 2) Retyping of the samples using
D5S818 monoplex PCR; 3) Genotyping of the +36T/C SNP using the
PCR-SSP approach; 4) Use of a D5S818 wobble-base primer in multiplex
STR-analysis.
STR Locus D5S818, Aallele Drop Out, Single Nucleotide
Polymorphism (SNP)
B165 Some Interesting Point Mutations
and Deletions Found Through STR
Allele Sequencing
sequencing results will be discussed in the context of the growing number
of more than 230 variant alleles reported and cataloged as part of the
National Institute of Standards and Technology STRBase website:
http://www.cstl.nist.gov/biotech/strbase/.
Methods and Materials: DNA sequencing primers lying outside of
PCR amplification assay primer binding sites have been designed and
tested for all 13 core STR loci used in the Combined DNA Index System
(CODIS) as well as the D2S1338, D19S433, Penta D, and Penta E loci that
are contained in commercial STR kits such as PowerPlex® 16, SGM Plus,
and Identifiler. A variety of polyacrylamide gel electrophoresis conditions
have been developed to separate closely spaced heterozygous alleles so that
these alleles can be individually sequenced. Gel cutouts (individual alleles)
are re-amplified prior to sequencing each allele. Variations in the individual
alleles are determined by aligning their sequence to a reference sequence
from GenBank. These alignments are assisted by the use of the software
program Sequencher 4.1 (GeneCodes, Ann Arbor, MI).
Summary of Results: The novel sequencing primers developed
encompass the primer binding regions of all known published primer
sequences for loci included in commercial STR kits and thus enable an
examination of polymorphisms giving rise to allele dropout upon PCR
amplification.
Conclusions: Methodologies for DNA sequencing of STR alleles can
aid in understanding the molecular basis for allele dropout due to point
mutations or insertion/deletions in template DNA that disrupt PCR primer
annealing. An increasing number of rare variant alleles are being discovered and information is being uncovered through DNA sequencing that
can be helpful in assessing natural human variation and developing
improved detection assays in the future.
References:
1. Budowle, B., et al. (2001) STR primer concordance study. Forensic
Sci. Int 124: 47-54.
2. Clayton T.M., et al. (2004) Primer binding site mutations affecting the
typing of STR loci contained within the AMPFlSTR SGM Plus kit.
Forensic Sci.Int. 139: 255-259.
3. Drabek, J., et al. (2004) Concordance study between miniplex STR
assays and a commercial STR typing kit, J. Forensic Sci. 49(4): 859-860.
Short Tandem Repeat DNA Typing, DNA Sequencing, Variant Allels
B166 Loss of Heterozygosity at Several Loci
of the 13 CODIS Core STR Loci in a
Patient Diagnosed With Cancer
Margaret C. Kline, MS*, Michael D. Coble, PhD, Jill E. Appleby, BS,
Richard Schoske, PhD, and John M. Butler, PhD, National Institute of
Standards and Technology, 100 Bureau Drive, MS 8311, Building 227,
Room B250, Gaithersburg, MD 20899-8311
Katherine E. Long, BS*, Rick W. Staub, PhD, Judith I. Floyd, BS, and
Robert C. Giles, PhD, Orchid Cellmark, 2600 Stemmons Freeway,
Suite 133, Dallas, TX 75207
Attendees will learn a methodology for sequencing variant STR
alleles will be described along with some interesting findings from samples
producing allele dropout upon PCR amplification with various primer sets.
humanity by enhancing the knowledge of the forensic community in
regards to methodologies used to define the differences found in variant
alleles.
Polymorphisms exist in the flanking regions of short tandem repeat
(STR) loci that can cause allele dropout when they fall underneath PCR
primer binding sites. The resulting “null alleles” are typically detected
when concordance studies are performed using sets of PCR primers with
different annealing positions (1,2). Some interesting deletions have been
discovered in the flanking regions of D13S317 and VWA through concordance studies between miniSTR assays and commercial kits (3). In
addition, several forensic laboratories have supplied samples possessing
some novel variants that have been characterized. These STR typing and
After attending this presentation, attendees will have an increased
awareness of the possibility of a complete or partial loss of heterozygosity
in a single source sample at multiple locations in nuclear DNA as a result
of deletions due to cancer.
humanity by making scientists aware of the possibility of observing a loss
of heterozygosity in a single source sample, which may be misidentified as
a mixture when an inadequate number of loci are tested.
It has been documented that a loss of heterozygosity in one of the
systems of the 13 CODIS core STR loci can occur due to actual autosomal
rearrangements associated with cancer. It is also known that a loss of heterozygosity can be observed in poor quality DNA samples from paraffin
embedded tissues resulting in stochastic effects during amplification. In
this particular case, a loss of heterozygosity was seen at more than one
locus in several specimens with some specimens exhibiting a loss of heterozygosity at up to four loci.
* Presenting Author
117
After a patient’s untimely demise from cancer, slides used in the
patient’s diagnosis were submitted for DNA analysis via STR testing to
ensure that the tissue on the slides was not contaminated by another
patient’s tissue during the preparation process for evaluation by a
pathologist. The patient in this case had initially been diagnosed with nonHodgkin’s Lymphoma. After treatment with chemotherapy, the lymphoma
was declared to be in remission. Approximately one year later, the patient
was found to have a growth in one of his lungs. This tumor was
subsequently diagnosed as being small cell carcinoma also known as oat
cell carcinoma. While being treated for the lung tumor, the patient suffered
a relapse of the non-Hodgkin’s Lymphoma. Although it was noted that the
lung tumor had begun to decrease in size the patient passed away a short
time later. Upon autopsy, there was no indication of the lung tumor and the
involved parties sent the paraffin blocks and related slides used to diagnose
the small cell carcinoma to two private forensic DNA laboratories in order
to determine the possibility of specimen mis-handling.
Peak imbalances observed in the samples tested from the patient led
the first forensics laboratory performing testing to conclude that the
samples were a mixture of the patient and another individual. However,
none of the eight loci tested exhibited more than two alleles.
The second laboratory (Orchid Cellmark Dallas) then received three
paraffin blocks and nine corresponding slides for testing and comparison
with STR testing. Portions of the paraffin blocks and related slides were
subjected to organic extraction via phenol chloroform and extracts were
purified and concentrated using Microcon centrifugal filter units. The
extracts were quantitated and initially amplified using Applied Biosytem’s
Profiler Plus Kit. At a later date, the samples were also amplified using
Applied Biosystem’s Cofiler Kit.
After injection into Applied Biosystem’s 310 Genetic Analyzer,
analysis was performed using Applied Biosysem’s GeneScan and
Genotyper. This analysis revealed severe peak imbalances in several
specimens at D3S1358 (in both Profiler Plus and Cofiler), Amelogenin
(in both Profiler Plus and Cofiler), D8S1179, D21S11, D5S818,
D13S317, D7S820 (in Profiler Plus only) and actual complete loss of heterozygosity at D5S818 and D13S317 in two samples. As seen in the data,
the loss of heterozygosity was neither more prevalent in the smaller
systems nor the larger systems. The peak imbalances varied from sample
to sample inasmuch as there were not only differences in the percentages of
peak RFU’s, there were also discrepancies as to which systems revealed
peak imbalances. Throughout all thirteen loci, no more than two alleles
were observed.
Several months later, tissue slides prepared at autopsy were received
and tested using methods identical to those used for the lung tissue slides.
Although the autopsy slide tissue seemed to be more degraded than the
lung tissue slides, the results obtained showed the same peak imbalances
consistent with a loss of heterozygosity.
Heterozygosity, STR, Cancer
B167 Patterns of Allele Sharing in
13-Locus DNA Profiles of Siblings
and Other Relatives
Julie B. Kempton, MS, MFS*, S. Meredith Monroe, MS, Sarah A.
Chenoweth, BA, Monica L. Ammann, MFS, Carter A. Cromartie, MFS,
and Kristen Johnson, BS, Prince George’s County Police Department,
DNA Laboratory, 7600 Barlowe Road, Palmer Park, MD 20785
After attending the presentation, the participants will gain an understanding of the usefulness and limitations of assessing whether similar
DNA profiles may come from related individuals. Determining such relationships can be a valuable tool in conducting criminal investigations.
humanity by demonstrating Identifying the likelihood that DNA profiles
118
are from close relatives can be of great value to criminal investigations.
This can aid investigators in identifying new suspects, and may result in
faster apprehension of perpetrators of serious crime.
In criminal investigations involving DNA evidence, it can be useful to
know if DNA profiles may have come from related individuals. Previous
studies have shown that the profiles of siblings match at six of the thirteen
CODIS loci, on average. Since matches at five or six loci are not
uncommon in unrelated individuals, the authors would like to assess
whether two similar profiles are the result of coincidence or biological relationship. Profiles from over one hundred sets of siblings were compared,
along with other first and second-degree relatives. The average number of
identical loci (both alleles shared) in full siblings was 4.7, with a range of
1 – 9. The average number of non-matching loci (neither allele shared) was
1.5, with a range of 0-5. These results were compared with a database of
several hundred unrelated individuals, with primary focus on those unrelated profiles with were identical at four or more loci. The average number
of non-matching loci in these pairs was approximately 4, with a range of 19. Thus, the number of non-matching loci is the best predictor of whether
two similar profiles are more likely from siblings than from unrelated individuals. However, because there is substantial overlap in the ranges,
caution should be used when assessing the possible biological relationship
of persons with similar DNA profiles. Another factor that should be considered is the overall expected frequency of the 13-locus profile. One individual in the database showed a high degree of similarity with a large
number of unrelated profiles, matching at seven loci in two separate
instances. The overall expected frequency of this profile is approximately
1 in 1 trillion (FBI Popstats). While this exceeds the threshhold for
declaring identity, it is considerably more common than the frequencies
observed for most 13-locus profiles.
The results of this study have proved useful in several cases in the
authors’ jurisdiction. In one such case, a bottle was obtained from the trash
of a possible suspect in a series of sexual assaults. A 9-locus DNA profile
obtained from the bottle matched the semen profile at six loci and shared
one allele at the three other loci, a strong indication that the DNA on the
bottle came from a sibling of the perpetrator (the suspect shared the house
with two brothers). Based on this information, surveillance was increased
on the suspect and a DNA sample was obtained when the suspect blew his
nose and discarded the tissue on the sidewalk. This sample matched the
semen profile from the sexual assaults, leading to the arrest and conviction
of the rapist.
DNA, STRs, Siblings
B168 Application of Multiple Displacement
Whole Genome Amplification to
Forensic DNA Analysis
Linda C. Rourke, MSFS, MPhil*, Annette T. Lee, PhD, and Peter K.
Gregersen, MD, North Shore/LIJ Research Institute, Department of
Genomics and Human Genetics, 350 Community Drive, Manhasset, NY
11030; and Margaret Wallace, PhD, and Peter R. De Forest, DCrim,
John Jay College of Criminal Justice, 445 West 59th Street, New York,
NY 10019
The goal of this presentation is to convey research findings evaluating
the fidelity of whole genome amplification by multiple displacement
amplification from DNA extracted from aged bloodstains.
humanity by describing research on the forensic applicability of a technique
which may allow forensic scientists to overcome the problem of limited
sample sizes and open the door for many additional types of forensic DNA
analysis that can be useful in the investigation of crime.
The recent completion of the human genome sequencing project has
created many opportunities for further elucidation of human genetics. Such
* Presenting Author
advances continue to fuel the explosive growth of forensic DNA
technology. The bottleneck in forensic science is that the quantity and
condition of forensic evidence samples frequently limit the extent of
analysis. Recent improvements in whole genome amplification may allow
forensic scientists to overcome the problem of limited sample sizes and
open the door for many additional types of forensic DNA analysis that can
be useful in the investigation of crime.
Multiple displacement amplification (MDA) is a method of whole
genome amplification (WGA) which is capable of providing large
quantities of human genomic DNA from limited sample sources. It is a
relatively new method which, although validated for various types of
clinical samples (whole blood, cheek cells, etc.), has yet to be tested on the
type of samples commonly encountered as forensic evidence. This
research seeks to determine whether WGA/MDA is a suitable means of
amplifying human genomic DNA from samples of a forensic nature.
Current forensic DNA methods amplify targeted areas of the human
genome in order to produce a genetic profile for the sample of interest.
However, forensic evidence samples are frequently limited to that which is
collected from a crime scene. A method that could accurately and representatively amplify the entire sample genome would provide sufficient
DNA for multiple analyses and for archival storage. Minute samples could
be amplified to ensure a sufficient quantity of DNA for both prosecution
and defense teams to analyze. Amplification of the entire genome would
also create sufficient DNA to analyze genomic loci that provide information useful in determining phenotypic characteristics of the unknown
source of biological evidence from a crime scene.
This research will determine whether WGA/MDA can provide
accurate STR profiles from DNA extracted from dried bloodstains. Blood
will be drawn from anonymous donors for the preparation of control DNA
and bloodstains. Control DNA will be extracted from fresh blood. Known
volumes of blood will be stained onto a white cotton substrate, dried, and
stored at room temperature. Stains will range in size based on the original
volume of fresh blood used to stain the substrate: 1µl, 10 µl, and 50 µl. As
an extraction control, the same volumes of blood will be aliquoted directly
into microfuge tubes and stored under the same conditions as the bloodstained swatches. DNA will be extracted from the stains and extraction
controls at various time points, ranging from Day Zero to 10 weeks, using
Gentra’s PureGene kit. Extracted DNA will be quantitated using PicoGreen
fluorescence. DNA extracted from aged bloodstains and extraction controls
will be amplified using Amersham’s GenomiPhi Kit. Control DNA from
the freshly drawn blood will also be amplified to compare the aged versus
control DNA. The amplified DNA will be quantitated using PicoGreen fluorescence. The whole genome amplified DNA will then be analyzed for 7
of the 13 short tandem repeat (STR) loci required by the FBI for inclusion
in the CODIS database system. The seven STR markers are D5S818,
D13S317, D7S820, FGA, D3S1358, D21S11, and D18S51. Control DNA
that has not been amplified via GenomiPhi will also be analyzed in these 7
loci. STR profiles from control DNA will be compared to the STR profiles
obtained from the GenomiPhi amplified aged bloodstain samples to
determine if the latter samples are capable of providing accurate DNA
profiles.
Forensic DNA Analysis, Multiple Displacement Amplification, Whole
Genome Amplification
* Presenting Author
B169 Degenerate Oligonucleotide-Primed PCR:
‘Proofreading’ a Method for Forensic
DNA Analysis
Denise N. Rodier, BS, Virginia Commonwealth University, 1000 West
Cary Street, PO Box 842012, Richmond, VA 23284; Kristen M. Meyer,
MFS, North Carolina State Bureau of Investigation, 121 East Tryon
Road, Raleigh, NC 27603; and Kristen E. Lewis, BS, and Tracey Dawson
Cruz, PhD*, Virginia Commonwealth University, 1000 West Cary Street,
PO Box 842012, Richmond, VA 23284
The goal of this research project is to provide the forensic DNA community with a Whole Genome Amplification (WGA) tool – Degenerate
Oligonucleotide-Primed PCR (DOP-PCR) – that can readily increase the
success rate of analysis of degraded, aged, or otherwise compromised biological evidence samples using existing conventional lab technologies and
standard procedures for data analysis. This presentation will aim to build
upon the data that was previously presented by showing improved amplification success using a dual-enzyme approach.
humanity by allowing for an increased success rate for cases where a very
low amount or unusable DNA was obtained from a crime scene, either
through lack of evidence altogether or through severe degradation of
samples. These samples can be analyzed by technicians without additional
training or equipment, and with minimal additional costs to the labs.
Whole genome amplification techniques have been utilized in a
number of molecular diagnostic areas, including embryonics, cancer
biology, histopathology, and in a variety of studies on molecular diseases
and genetic linkage. Degenerate Oligonucleotide-Primed PCR (DOPPCR) is one such whole genome amplification technique which allows for
low copy number DNA samples to be preamplified such that high quality,
high yield DNA samples can be available for downstream forensic STR
amplification and analysis. Thus far, standard DOP-PCR techniques have
shown to sufficiently generate enough high yield, high molecular weight
DNA for STR analysis by capillary electrophoresis. However, results show
some preferential amplification and allele/locus drop out in these subsequent multiplex STR amplifications. By adding a proofreading enzyme
(i.e., Pyrococcus furiosus) in a small ratio to the Thermus aquaticus
enzyme currently used with DOP-PCR and increasing extension times
during thermalcycling, longer-sized products should be achieved. This will
greatly reduce the preferential amplification and allele/locus drop out seen
in multiplex STR amplifications. Initially, input DNA amounts ranging
from 0.25 nanograms to 7.5 picograms were tested in four DOP-PCR
setups using either Taq enzyme with Taq buffer, Pfu enzyme with Pfu
buffer, 16:1 Taq/Pfu enzyme combination in Taq buffer, or 16:1 Taq/Pfu
enzyme with Pfu buffer in either 50ul or 100ul reaction volumes. All
resulting DNA was visualized by agarose gel electrophoresis and human
DNA was quantitated by the traditional Quantiblot method. Preliminary
results indicate that while the standard DOP-PCR reaction (using Taq
enzyme in Taq buffer) produced products with a size range of approximately 250bp to 2,000bp, the Taq/Pfu enzyme combination produced
products with a size range of approximately 500bp to over 5,000bp.
Additionally, preliminary data from the Taq/Pfu enzyme combination
experiments indicate that input DNA amounts as low as 7.5 picograms (~2
cells) yielded enough DNA to be visualized on a 1% agarose gel, and DNA
yields increased by several thousand-fold for samples with as low as 62
picograms input DNA. Further research will evaluate the ability of DOPPCR products produced with the enzyme combination approach to generate
a correct profile with distinct and balanced peaks at all multiplexed STR
loci with minimal stochastic variation. In addition, other DOP-PCR
enzyme combinations and WGA techniques will also be evaluated in a
similar manner.
119
These research findings will impact the forensic DNA community by
allowing for an increased success rate for cases where a very low amount
or unusable DNA was obtained from a crime scene, either through lack of
evidence altogether or through severe degradation of samples. These
samples can be analyzed by technicians without additional training or
equipment, and with minimal additional costs to the labs.
Whole Genome Amplification, DNA, STR Analysis
B170 Assessment and In Vitro Repair
of Damaged DNA Templates
Ashley M. Hall, MS*, and Jack Ballantyne, PhD, University of Central
Florida, National Center for Forensic Science, PO Box 162366, Orlando,
FL 32816-2366
Attendees will learn methods for the assessment and repair of
damaged DNA templates derived from forensically relevant samples.
At the present time, little is known about the damage done to the DNA
in biological stains exposed to various exogenous insults. This presentation
will impact the forensic community and/or humanity by presenting the first
comprehensive study of this damage at the molecular level and intoduce
methods for the repair of the damaged DNA, facilitating the recovery of a
genetic profile.
DNA extracted from biological stains is often intractable to analysis.
This may due to a number of factors including a low copy number (LCN)
of starting molecules, the presence of soluble inhibitors or damaged DNA
templates. Remedies may be available to the forensic scientist to deal with
LCN templates and soluble inhibitors but none presently exist for damaged
DNA. In fact, knowledge of the biochemical nature and the extent of DNA
damage in physiological stains is rudimentary at best. Also unknown is the
point at which the damage inflicted upon a particular sample precludes the
ability to obtain a genetic profile for purposes of identification. Therefore,
the primary aims of this work were first ascertain the types of DNA damage
encountered in forensically relevant stains, correlating the occurrence this
damage with the partial or total loss of a genotype, and then to attempt the
repair of the damage by means of in vitro DNA repair systems.
The initial focus of the work was the detection of damage caused by
exogenous, environmental sources, including factors such as UV irradiation, heat, and humidity. By incorporating various lesion specific
enzymes, a set of assays, both PCR and gel-based, have been developed
which describe the type and extent of damage inflicted upon DNA, both in
a hydrated and dehydrated state. Using these procedures, the major causes
of damage have been identified and their effects on genetic profiling
assessed.
Armed with this knowledge, the next focus was the repair of the
damage by means of in vitro DNA systems. Efforts have been concentrated
on base excision repair, single strand gap repair, and translesion synthesis
assays. By modifying the assays and employing various combinations of
the systems, a genetic profile has been obtained from previously intractable
samples.
DNA Damage, In Vitro DNA Repair, Lesion Specific Endonucleases
B171 Age Determination: The Identification
of Newborns Using Messenger RNA
Profiling Analysis
Michelle Alvarez, BS*, and Jack Ballantyne, PhD, University of Central
Florida, Department of Chemistry, PO Box 162366, Orlando, FL
32826-2366
Attendees will learn a method to determine if a bloodstain originated
from a newborn baby.
by demonstrating the development of a novel method, which can be incorporated into the forensic laboratory, to aid in investigations concerning bloodstains thought to originate from newborns.
It is now a matter of routine for the forensic scientist to obtain the genetic
profile of an individual from DNA recovered from a biological stain deposited
at a crime scene. Potential contributors of the stain must either be known to
investigators (i.e., a developed suspect) or the questioned profile must be
searched against a database of DNA profiles such as those maintained in the
CODIS National DNA database. However, in those instances where there is
no developed suspect as yet or there is no match with any database sample, the
DNA profile per se presently provides no meaningful information to investigators, with the notable exception of gender determination.
To aid in these investigations another useful biometric that could
provide important probative information is the age of an individual. For
example, the ability to provide investigators with information as to whether a
DNA donor is a newborn baby, an adolescent teenager or an elderly individual could be useful in certain cases, particularly those involving young
children such as kidnapping or in providing additional intelligence during terrorist investigations. Currently no reliable validated molecular tests are
available for age determination.
The lifecycle of humans comprises a number of developmentally recognized stages. As the human proceeds through these developmental stages,
sub-sets of the 30-50 thousand human genes will be differentially expressed.
Theoretically, and given sufficient knowledge of developmental genetics, a
determination of the global gene expression profile could reveal constellations of genes whose expression is correlated with a specific age.
One example of how developmental regulation of gene expression can
lead to the determination of age is by examining the ß-hemoglobin locus
located on the short arm of chromosome 11 (11p15.5). This chromosomal
region encodes five functional ß-like globin genes, ε, γG, γA, δ and ß, each with
a specific pattern of highly regulated developmental gene expression. In the
first weeks of neonatal development embryonic hemoglobin (ξ2, ε2) is produced by the yolk sac. Around twelve weeks of gestation embryonic hemoglobin synthesis decreases and the fetal liver, spleen, and bone marrow begin
producing fetal hemoglobin (α2, γ2), which continues throughout fetal development. Shortly after birth fetal hemoglobin production decreases and the
synthesis of adult hemoglobin (α2, ß2) rises and is the major form of hemoglobin present throughout life. Therefore, the development of an assay which
selectively identifies an increased presence of fetal hemoglobin (γ chain) in a
biological stain, would infer that the donor of the stain is a newborn baby.
Descrived here are two novel methods which assay the age related
levels of variant forms of gamma hemoglobin (HBGv) present in bloodstains,
with an increased level of expression being indicative of the newborn status
of the individual. The first method is a duplex reverse transcription-polymerase chain reaction (RT-PCR) and allows for the determination of a
newborn based on a present / absent gamma hemoglobin product, along with
the presence of an internal control, the ribosomal protein S15. A second realtime-PCR (qPCR) assay, can distinguish between newborns and other age
groups by evaluating the ∆Ct values (Ct S15 - Ct HBG) generated. A positive
∆Ct value would indicate that a bloodstain originated from a newborn; in contrast a negative ∆Ct value would be obtained with all other ages.
Age Determination, Identification of Newborns, Messenger RNA
Profiling
120
* Presenting Author
B172 mRNA Profiling: Body Fluid Identification
Using Multiplex Real-Time PCR
Jane S. Juusola, BS*, University of Central Florida, Department of
Chemistry, PO Box 162366, Orlando, FL 32816-2366; Kevin W.P.
Miller, PhD, FBI Academy, Building 12, CTFSRU, Quantico, VA 22135;
and Jack Ballantyne, PhD, University of Central Florida, Department
of Chemistry, PO Box 162366, Orlando, FL 32816-2366
Attendees will learn a novel means of identifying body fluids of
forensic interest.
humanity by demonstrating the mRNA based approach, such as the multiplex real-time PCR method described here, possibly allowing for the
facile identification of body fluid stains and is one of many assay platforms
that could conceivably supplant the battery of serological and biochemical
tests currently employed in the forensic serology laboratory.
Conventional methods of body fluid identification use labor-intensive,
technologically diverse techniques that are performed in a series, not parallel manner, and are costly in terms of time and sample. Furthermore, for
some frequently encountered body fluids no confirmatory technique exists.
There is no definitive test, for example, for the presence of saliva or vaginal
secretions. In seeking to develop novel multiplex (i.e., parallel) analysis
procedures for body fluid identification that are compatible with current
DNA analysis procedures, The authors have chosen assays based upon
messenger RNA (mRNA) since it is expressed in a tissue type specific
manner. Terminally differentiated cells, such as blood lymphocytes, ejaculated spermatozoa, or epithelial cells lining the oral cavity, have a unique
pattern of gene expression, which is evinced by the presence and relative
abundance of specific mRNA species. If the type and abundance of
mRNAs can be determined in a stain or tissue sample recovered at the
crime scene, it would be possible to definitively identify the tissue or body
fluid in question. Advantages of an mRNA-based approach, compared to
conventional biochemical analysis, include greater specificity, simultaneous, and semi-automated analysis though a common assay format,
improved timeliness, decreased sample consumption, and compatibility
with DNA extraction methodologies.
It was previously reported that it is possible to isolate total RNA of sufficient quality and quantity from biological stains to enable subsequent
detection of particular mRNA species using the reverse transcription-polymerase chain reaction (RT-PCR) technique and that has identified candidate
sets of blood-, saliva-, semen-, vaginal secretions-, and menstrual blood-specific genes using a combination of literature and public database searches.
In the present work, the authors report the development of a set of
multiplex real-time PCR assays for the definitive identification of blood,
saliva, semen, vaginal secretions, and menstrual blood. Real-time PCR
employs a 5' nuclease assay to detect specific amplimers and eliminates the
need for post-PCR processing and gel electrophoresis. The real-time
instrument is capable of multi-color detection, and so by using probes
labeled with different reporter fluorophores, it is possible to develop multiplex assays for body fluid identification. Real-time PCR also has the
ability to quantitate target sequences, which is important in establishing the
tissue-specificity of a gene product, particularly when the relative abundance of a number of different mRNAs can demonstrate a unique or
restricted pattern of expression.
Real-time PCR triplexes were developed that are composed of two
body fluid-specific genes and one housekeeping gene and have been optimized for the detection of blood, saliva, semen, vaginal secretions, and
menstrual blood as single or mixed stains. The methodology is based upon
determining the delta Ct (∆Ct) values generated using the Ct for the housekeeping gene (HSK) and the Ct for each of the body fluid-specific genes
(BFG) (Ct HSK- Ct BFG). Depending upon the body fluid-specific gene
being tested, a positive ∆Ct value would indicate the presence of a particular body fluid, while a negative ∆Ct value would indicate the absence of
that body fluid.
* Presenting Author
An mRNA based approach, such as the multiplex real-time PCR
method described above, could allow the facile identification of the tissue
components present in a body fluid stain and is one of many assay platforms that conceivably could supplant the battery of serological and biochemical tests currently employed in the forensic serology laboratory.
mRNA Profiling, Multiplex Real-Time PCR, Body Fluid
Identification
B173 Individualization of Acer rubrum Using
Amplified Fragment Length Polymorphism
Margaret M. Wallace, PhD*, and Christine Bless, BS, John Jay College
of Criminal Justice, Department of Sciences, Room 4510, 445 West 59th
Street, New York, NY 10019; and Heather Palmeter, BS, America's Choice
Healthplans, 1429 North 11 Street, King of Prussia, PA 19406
Attendees will learn how the AFLP technique is a rapid, inexpensive,
and efficient method that can be used to genotype DNA from botanical
material. Within the closed set of samples used in this study, the AFLP profiles were species specific and unique.
AFLP is a rapid, cost-effective, simple, and robust method that can be
used to genotype DNA of any origin and complexity. The technique can be
used by forensic scientists to type DNA from nonhuman biological evidentiary material (plants, insects, and animals). This presentation will impact
the forensic community and/or humanity by adding to the repertoire of
techniques available to forensic scientists and increase the probative value
of nonhuman DNA evidence.
Amplified fragment length polymorphism (AFLP) is a powerful
method that combines techniques from classical hybridization-based and
PCR-based genotyping strategies. AFLP was used to genotype leaf
material from red maple trees, Acer rubrum, which are widely distributed
throughout much of the United States and Canada. Duplicate samples from
40 Acer rubrum trees were collected from four different sites in central
New Jersey. Samples from five additional species were collected for comparison. One set Acer rubrum samples was used to establish a DNA
database. The second set of Acer rubrum samples and the comparison
samples were analyzed and compared to the AFLP profiles in the database
to determine the discriminative capacity of the technique.
The AFLP protocol was performed using components from the AFLP
Core Reagent and Preamp Primer Mix I kits (Invitrogen, Rockville, MD).
Genomic DNA was double-digested by two restriction endonucleases:
EcoRI and MseI. The DNA fragments were ligated to EcoRI and MseI
oligonucleotide adapters to generate primer binding sites. In this manner a
select set of DNA fragments can be amplified without knowledge of the
sequence. Two consecutive PCR reactions (preamplification and selective
amplification) were performed. In the preamplification reaction DNA fragments were amplified using primers complementary to the adapters and
adjacent restriction sites with one selective nucleotide at the 3' ends:
EcoRI (5'-GACTGCGTACCAATTCA-3'; MseI (5'- GATGAGTCCTGAGTAAC-3'). During selective amplification the products of the preamplification reaction were amplified using a primer pair with three selective
nucleotides at the 3' ends: EcoRI [5'- (dyeD4) GACTGCGTACCAATTCACT-3', Proligo, Boulder, CO] labeled with the fluorophore (D4WellRed, Beckman Coulter); MseI (5'- GATGAGTCCTGAGTAACAT-3',
Invitrogen). The primer design and amplification strategy ensured that
only a subset of the EcoRI- MseI fragments was preferentially amplified.
The DNA fragments were separated by capillary electrophoresis using
the CEQ 8000 DNA Fragment Analyzer. Data were analyzed using the CEQ
2000XL (Beckman Coulter) and Twin Peaks (authors, proprietary) software.
Within this closed set, AFLP profiles were species specific and
unique. The individualization of plant matter will enable forensic scientists
to derive more information from evidentiary material and to help link a
suspect or a victim to a particular crime scene (source tree).
DNA, AFLP, Acer rubrum
121
B174 Extraction and Amplification of
Nuclear DNA From Shed Dog Hairs
Colinette S. Heath, MSc*, Eleanor A.M. Graham, MSc, and Guy N.
Rutty, MD, MBBS, FRCPath, University of Leicester, Robert Kilpatrick
Clinical Sciences Building, Leicester Royal Infirmary, Leicester,
Leicestershire LE, United Kingdom
Attendees will learn how to successfully extract and amplifly several
highly variable canine microsatellites for unique identity testing from shed
dog (Canis familiaris).
Upon completion of this research DNA profiles of unrelated dogs
from different breed origin will be produced. This will not only provide
verification of identity but will also display genetic diversity within inbred
dogs. This presentation will impact the forensic community and/or
humanity by providing a valuable asset to forensic science by opening new
possibilities for linking suspects to crime scenes or victims.
Hypothesis: That it is possible to extract genomic DNA from shed
dog hairs to facilitate the animal's identification, parentage verification, and
possibly link suspects to crime scenes or victims. At present, very little
effort has been made to extract nuclear DNA from dog's hair and in previous studies this has often been proven unsuccessful. This study, however,
provides information on the retrieval of genomic DNA from shed dog hairs
and has shown that though difficult it is indeed possible.
Text: DNA profiling of STR loci is now well established and extensively used for human identity testing such as identification of missing
persons, investigation of crimes, cases of disputed paternity, investigation
of mass disaster, and solving historic cases. However, the process of individual genetic identification has not been limited to human; attention has
been paid to other organisms, including farm animals and pets. In addition
to parentage verification and identification, nuclear and mitochondrial
DNA profiling of animal samples (blood, saliva, tissues, and hairs) has contributed to homicide investigations and convictions.
Shed animal hair is one of the most common biological materials
recovered during forensic evidence collection. Extraction and successful
PCR amplification of DNA from recovered hair could provide powerful
intelligence to aid criminal investigations. Previous studies have however,
shown that shed hairs contain only minute amounts of undegraded DNA,
therefore analysis of nuclear DNA is mostly unsuccessful. This paper
however, presents results of genetic profiling of nuclear DNA extracted
from naturally shed dog hairs. Experimentation with three different
extraction methods was undertaken, a modified Chelex extraction method
proved the most successful in extracting amplifiable nuclear DNA.
Modifications of the Chelex extraction include pre-extraction preparation
with proteinase K, incubations at 56°C and 100°C plus micro-concentration
of the solution. The quantity of extracted nuclear DNA was shown to be
adequate for PCR based typing at 3 loci. This study shows that nuclear
DNA can reproducibly be obtained from shed dog hairs.
Dog Hair, DNA Extraction, DNA Profiling
122
* Presenting Author
Engineering Sciences
C1
Injury Pattern Analysis in Fatal
Traffic Crash Investigation
Michael D. Freeman, PhD, DC, MPH*, Oregon Health and Science
University School of Medicine, 3071 Dogwood Drive South, Salem, OR
97302; and Clifford Nelson, MD, Medical Examiner Division, Oregon
State Police, 301 Northeast Knott Street, Portland, OR 97212-3092
After attending this presentation, attendees will understand some
principles of crash investigation, the necessary elements for the application
of Injury Pattern Analysis, characteristic injury patterns of certain types of
crashes, and an example of a practical application of Injury Pattern Analysis
humanity by serving as a key aspect of fatal crash investigation as it can
augment traditional means of investigation in a systematized format via
interdisciplinary communication and collaboration.
Reconstruction of a fatal crash can be augmented, in certain circumstances, by information gleaned from the postmortem evaluation. Further
improvement of the scope and accuracy of an investigation can result from
evaluation of the injuries of crash survivors, taking into account the
conformity of individual vehicle interiors as well as the movement of the
occupants during the crash.
The term “Injury Pattern Analysis (IPA)” is proposed as a description
of a fatal crash investigation technique that utilizes accident investigation,
and reconstruction techniques, occupant kinematics, postmortem records,
hospital and healthcare provider acute injury records, and other evidence as
an adjunct to the investigation of homicides resulting from fatal crashes.
The authors present a case study in IPA as an example of the practical
application of the technique. It is recommended that medicolegal death
investigators become familiar with the principles of IPA.
Crash, Fatal, Investigation
C2
Numerical Models in Motor Vehicle
Accident Reconstruction With Case Studies
Matthew Weber, BSE*, Chris Van Ee, PhD, Design Research Engineering,
46475 DeSoto Ct., Novi, MI, 48377; and Boyd Allen, MASc, PE*,
MacInnis Engineering Associates Inc., 21076 Bake Parkway, Suite 106,
Lake Forest, CA, 92630
The goal of this presentation is to equip the attendee with an understanding of which collisions are suitable for numerical simulation techniques and some of the sensitive and insensitive input parameters used in
the simulations.
humanity by making the forensic community aware to highlight sensitive
input parameters in commercial accident reconstruction simulation
software and contrasts some of the available software. This presentation
demonstrates that a variety of computer programs are capable of generating
similar and accurate results.
Reconstruction of a motor vehicle accident using different computer
software packages renders similar results if the packages are used appropriately. However, pre and post impact driver actions/reactions need to be
interpreted with caution and can affect the results of the analysis.
High-speed collisions can be analyzed using several available tools,
which are more directly applicable than for low speed collisions. This is
due in part to the fact that much of accident reconstruction theory and
available test data originated with test speeds in the 30-35 mph range. A
brief overview of the types of tools available for reconstructing high-speed
accidents is presented. Several popular computer programs employing
these tools and the associated assumptions are utilized in case studies. A
* Presenting Author
high-speed crash test in which one vehicle is driven into the side of a stationary vehicle and an actual “real world” left turning accident with two
moving vehicles are used for illustration and comparison of the available
methods and computer packages. Several computer programs, which are
widely used for accident reconstruction, are used to reconstruct the collisions. The programs WinSlam© and EDCRASH™ are used to analyze the
impacts from an energy standpoint. The programs PC Crash,
EDSMAC4™, and DyMESH® simulate the impact and subsequent postimpact travel. The results of the various methods and their relationships to
the known crash test parameters will be addressed. Additionally, some of
the assumptions and inputs required by the tools are varied to illustrate their
effects on the final results.
Some simulation programs are not always directly applicable to low
velocity impacts. “Low velocity” impacts between motor vehicles is a
somewhat arbitrary term that here will refer to collisions involving very
little or no physical crushing of the vehicles. Low velocity collisions often
cannot be adequately analyzed using some traditional high-speed numerical
techniques.
Accident Reconstruction, Computer Modeling, Simulation
Comparison
C3
Weakness in the Numerical Models
Used in Accident Reconstruction Programs
John J Smith, MSEE, MSBMT*, Raymond P. Smith and Associates,
43766 Buckskin Road, Parker, CO 80138
After attending this presentation, attendees will understand the limitations of using computer programs in accident reconstruction.
humanity by identifying the limitation of the computer programs allowing
the forensic community to understand when the results provided are significant and when they have little value.
In the last several years, there has been an increasing usage of equations from various programs, like CRASH (Calspan Reconstruction of
Accident Speeds on the Highway) and SMAC (Simulation Medel of
Automobile Collisions), their derivatives, and other programs to determine
pre impact and post impact velocities of vehicles. The use of equations
from various programs, without regard for the underlying simplifying
assumptions and checking routines, leads to errors and inaccuracies.
The underlying physics of accident reconstruction has been analyzed
and compared to the assumption used in several programs. The first area
addressed were those based on CRASH. The analysis was performed by
comparing the simplifying assumptions in the programs to the actual values
expected in collisions. Additionally the simplifying assumptions were
checked for internal consistency. One area of particular concern was if the
program violated a simplifying assumption required in the derivation of the
equations necessary to develop the program. As an example, if the underlying equations used a simplifying assumption of homogeneity and then the
program instructed the user to input values that established the surface was
not homogeneous, this was identified as a potential problem. Finally, the
computer-generated results of tests were compared with the actual speeds
of the vehicles to determine if the program was accurate
A fundamental principle of mathematics is that for every unknown in
a problem, a separate, independent equation must exist in order to arrive at
a unique solution. In accident reconstruction the common unknowns of
interest include: the mass of Vehicle 1, the mass of Vehicle 2, the initial
speed of Vehicle 1, the initial speed of Vehicle 2, the final speed of Vehicle
1, the final speed of Vehicle 2, the approach angle of Vehicle 1, the
approach angle of Vehicle 2, the departure angle of Vehicle 1 and the
departure angle of Vehicle 2.
123
Less common, although often-critical variables include, tire forces,
friction, steer angles, stiffness values, slope, surface material, and tire design.
In order to resolve the problem, equations are often solved simultaneously. Common fundamental equations used are conservation of linear
momentum, conservation of angular momentum, conservation of energy,
the principle of restitution, Newton’s Laws of Motion, and the basic
equations of motion. As the complexity of the problem increases, more
equations are required to achieve a unique solution. As the number of
variables and equations increase, the use of computers becomes more
beneficial. This, in turn, explains the proliferation of programs available.
Even the use of computers does not relieve the investigator of the
basic need of a separate equation for each variable. Compounding the
problem is the use of quadratics, in some of the equations, since quadratics
usually do not have a unique solution. For this reason, it is common to use
simplifying assumptions and secondary equations such as those postulated
in the work of Campbell or McHenry. Often these secondary equations are
based on the same or additional assumptions.
As a result of the analysis it was determined that the numerical models
used to predict the impact speed of vehicles have several limitations. The
underlying simplifying assumptions used to derive the equations of the
CRASH model in particular were found to have numerous problems.
Among the critical assumptions identified in the derivation of the algorithm
were several that were immediately violated by the program. These
assumptions included that the vehicles act like a mass with a spring, the
spring constant is constant, only plastic deformation occurs, the spring constants for both vehicles are equal, crush is symmetrical on both vehicles, the
crush distance equals the acceleration distance and the system acts like a
simple harmonic oscillator. Occasionally some of these assumptions are
met, but it is rare that all are met and it is common that none are met.
Typically, the program requires the operator to violate most, if not all of
these assumptions.
In addition to the primary part of the program, the crush coefficients
used are derived by a separate approach that uses many of the above
assumptions and actually adds additional ones including the assumption
that the vehicles are homogenous both vertically and horizontally.
The full-scale crash test run to validate the model actually showed that
the results had no statistical significance. In some cases the program
returns impossible answers. In other cases, the error associated with
CRASH predictions has been observed to exceed 100%.
The use of CRASH, and its derivative programs, to reconstruct
automobile collisions is valid only under certain conditions. The results
obtained have limited statistically value. Anytime the programs are used,
the assumptions should be checked for validity and how well the assumptions are met by the facts of the collision.
The approach used in this analysis has application in evaluating the
reliability of any program used in accident reconstruction.
Computer Model, Accident Reconstruction, Crash
C4
Understanding Injury Potential in
Low Damage Automobile Collisions
Peter Alexander, PhD*, Raymond Smith & Associates, 43766 Buckskin
Road, Parker, CO 80138
The goal of this presentation is to provide further insight into correlation between vehicle damage and impact severity.
Observation of body damage coupled with frame deformation may
provide criteria by which to judge impact speeds in situations where a
visual examination of the vehicle shows little or no damage. This presentation will impact the forensic community and/or humanity by describing
impact speed thresholds, which can prove helpful in understanding the
injury severity in what otherwise, might appear to be a very low speed
impact.
INTRODUCTION: Raymond Smith and Associates is sometimes
confronted by cases in which a vehicle has been impacted by another
124
vehicle, resulting in little or no visible damage. The driver of the target
vehicle has sustained some fairly serious injuries, as determined by their
physicians. How can the significant occupant injuries be reconciled with
the apparent lack of significant vehicle damage? An approach has been
developed, which demonstrates that in a number of these cases, despite the
absence of obvious visible vehicle damage, the frame (or unibody) of the
target vehicle was deformed by the force of the collision.
A number of recent cases involve collisions in which a vehicle’s driver
or passenger sustained significant head, neck, and back injuries. A
physician diagnosed the injuries. The vehicle inspection often showed little
to no obvious visible damage. Sometimes the bumper cover was scuffed,
or there was a slight indentation in the bumper cover. Detailed body shop
repair estimates for the vehicles, when available, showed either no damage
or a need to replace only the bumper cover.
A reconstruction expert claimed that because the damage level was so
low, the bullet vehicle impact speed was under 5 m.p.h. and the speed
change of the injured party’s target vehicle was less than 3 m.p.h. Thus it
was unlikely that they would have been injured.
THE APPROACH: When examining the target vehicle, the author
looked at the fit of the hood, the trunk lid, and the doors. The eye can easily
see a distortion of less than 1 millimeter in the fit of these items. If the
spacing between these components and the vehicle’s body appeared to be
uneven, a precision frame measurement was recommended. In every one
of 14 recent cases, where visual evidence of external body distortion was
observed, the precision frame measurement verified that the frame or
unibody had been deformed beyond factory specifications. The 14 cases
shown in Table 1, involved different vehicles impacted from the front, the
rear, and the sides.
In most of the cases where this method was applied, the frame or
unibody distortion was approximately 1 centimeter. This is not necessarily
sufficient to cause difficulty steering, or uneven tire wear. It is, however,
indicative of a very forceful impact at a speed far above the 5 m.p.h. cited
by the other expert.
If no evidence of frame distortion was observed, removal of the
bumper cover and disassembly of the bumper system often revealed deformation of the underlying bumper structure. Following the collision, in
several cases, the bumper cover popped back out to its pre-impact position,
masking the damage.
Frame deformations of ~1 centimeter are indicative of impact speeds
in the range 15 to 25 m.p.h. This speed range can be identified because, in
a number of cases where frame distortion was observed, the impact speed
could be independently determined based on post impact movement of the
vehicles involved. Bumper damage generally does not appear in vehicleto-vehicle collisions below 8 to 10 m.p.h. Frame distortion is generally not
seen below 12 to 15 m.p.h. At impact speeds in excess of 25 m.p.h. one
would expect to see serious body damage to the vehicles.
The literature contains reports of numerical modeling efforts, which
attempt to correlate the forces imposed on a vehicle, in a collision, with the
expected deformation of the vehicle. At present, these models are still in
their infancy, and are not capable of predicting the type of deformations,
which are the subject of this paper. At some point it may be possible to
determine the impact speed, which caused a particular frame deformation,
using a finite element numerical modeling approach.
UNDERSTANDING INJURY POTENTIAL: The technical literature supports the view that there is no minimum or threshold vehicle
impact speed (or speed change) required for occupant injury to occur.
Logically, the higher the speed change, the greater the probability of injury.
A portion of the impact energy is channeled into the vehicle’s occupants.
Injury to the occupants can occur as a result of the acceleration forces and
from interaction between the occupant and the interior components of the
vehicle, including the seat belt. Observation of body damage coupled with
frame deformation may provide criteria by which to judge impact speeds in
situations where a visual examination of the vehicle shows little or no
damage. The impact speed vs. damage described can prove helpful in
understanding the injury severity in what otherwise might appear to be a
very low speed impact.
* Presenting Author
Table 1 FRAME/UNIBODY DEFORMATION CASE TABULATION
IMPACTED
VEHICLE
IMPACT
LOCATION
IMPACT
SPEED
(mph)
REPAIR $
DEFORMATION
(mm)
INJURY
1992 Nissan Maxima
Left Side, L.F. Tire
25-35
Tire Involvement
4691
4
Lumbar, required
spinal fusion
1995 Honda Accord
Left Front End
25-35 Tire Involvement
6805
6
No data
1997 Ford F150 PU
Right Rear
37-40
1954
7
Ruptured L5-S1
1994 Dodge Ram 1500 PU
Rear
15-25
3367
14
Herniation L5-S1
1992 Buick Le Sabre
Rear
>25
736
32
Stenosis at L3/4 , L4/5
and L5/S1
2000 Ford E250 Van
Front & Rear
Moderate
3839
5
1995 Ford Explorer 2WD
Rear
20-35
4031
18
1998 Toyota Corolla
Rear
15-25
422
6
1992 Ford T.Bird
Rear End
20-25
5354
11
Herniated disk at L5
2002 Saab
Left side, front tire
20-35
-
38
Cracked teeth,
back problems
1989 Ford Tempo
Rear
22
~500
11
Herniated disks C4-C5
1991 Chevrolet Blazer
Rear End**
20-35
2888
8
3 back surgeries:
laminectomy, fusion
1998 GMC Suburban
Rear End
15-25
110
8
Closed head injury,
cervical injuries
1999 Jeep Wrangler
Rear End
20-25
None
17
TMJ, Back injuries
Brain injury
Herniation L4/5 and L5/S1
Required spinal fusion
Injury, Collision, Frame
C5
A Proposed Practice for the Correct
Forensic Interrogation of Non-Volatile
Memory Data in Evidentiary Vehicle
Electronic Control Units
William Rosenbluth, MS*, Automotive Systems Analysis, Inc., 12015
Canter Lane, Reston, VA 20191
humanity by discussing information on new forensic practices and
procedures in a new and growing area of forensic technical investigation,
electronic data recovery and documentation. It is important for the
practicing forensic professional be familiar with proper procedures so that
he or she can avoid pitfalls or errors that can jeopardize forensic findings
and Court credibility, because existing practices and procedures often do
not cover methods of electronic data recovery and documentation.
SYNOPSIS: This presentation discusses methods and considerations
for the examination and interrogation of non-volatile memory data in
evidentiary vehicle electronic control units (ECUs) that may have been
involved in an event or incident that may be reasonably expected to be the
subject of litigation. This practice is intended to become applicable when
it is determined that examination or interpretation of such non-volatile
memory data may produce probative evidence. These methods are being
considered for a new Practice for the Investigation of Non-Volatile Memory
Data in Evidentiary Vehicle Electronic Control Units, currently being
considered by ASTM committee E30.05 on Forensic Engineering.
LEARNING OBJECTIVES: By observing the elements of this proposed protocol, the attendee will learn several methods for conducting an
examination for the controlled interrogation of the data in a subject vehicle
* Presenting Author
electronic control unit (ECU). Such data may be saved in ROM, EPROM,
EEPROM1 or flash-memory, all of which are non-volatile forms of
memory. The retrieval of such data is commonly referred to as a download
of information from the subject device2.
A further objective of this proposed protocol is to retrieve any such
data with the highest assurance of not changing or disturbing that data,
either by erasure or overwriting. Such a download is referred to as a forensically neutral3 download. A forensically neutral download can be accomplished with a load box/interface containing proper electrical loads and
interfaces, or by using an exemplar vehicle for the same purpose. An
example of a non- forensically neutral download is shown in Figure 1, and
an example of a forensically neutral download is shown in Figure 2.
Figure 1
Figure 2
Certain commonly used commercial interrogating tools are not forensically neutral when used in a direct umbilical mode to interrogate SRS
ECUs (i.e., a direct connection to the SRS ECU). In that mode, certain
external fault codes will be added (or re-detected) because there is no
provision for proper dummy-load resistors in the tool cabling. If the data
of interest is not changed (e.g., crash data parameters), then a non-forensically-neutral interrogation may be acceptable. If certain fault codes are of
125
interest, then a non-forensically-neutral interrogation may not be
acceptable. If a potential DTC data change is not acceptable, other test
equipment, laboratory breadboards and/or the use of an exemplar vehicle
can avoid this problem. In general, it is expected that the test conductor
will have a proper test fixture, and a proper exemplar component to demonstrate that his/her test bed is forensically neutral.
If the subject component is considered as evidence in litigation, and
the manufacturer or supplier of the subject ECU is, or may be, a party to
that litigation, it shall be considered standard practice to give the opportunity of first (qualified, non-destructive, non-intrusive, non-altering)
download to the manufacturer or supplier of the ECU, with all adverse
parties observing. This does not apply to exploratory interrogations or
analyses of ECU components, which may be considered exemplar
components.
THEORY OF THE ANALYSIS: Electronic data within any ECU is
an encoded representation of information, constants and variables used to
govern the function of an electronic control unit, as well as to describe and
document the version and level of such data. Such data are normally saved
in a binary bit format. In order to create a concise representation of such
data, it is usually represented by eight binary bit values, and these values
are commonly represented as bytes of data, each byte having a specific
memory address. Although most of the data referenced in this practice are
saved in EEPROM, certain other data can be saved in ROM, EPROM or
flash memory.
In general, the test conductor should perform two test series, with two
devices under test (DUT). The first series should involve an exemplar
device (to provide a baseline verification of the test fixture) and the second
series should involve the subject ECU.
A. Power off test fixture (can include optional use of
subject/exemplar vehicle as test fixture).
B. Select DUT.
C. Install DUT. DUT installation should include physical stability
integrity if there is any chance that physical movement during
the interrogation cycle will change the data within the DUT.
D. Power on test fixture with DUT installed. Observe MIL codes
and other-indicator status. Visually record.
E. As appropriate, interrogate DUT with standard scan tool to
observe scanner data (DTCs & PIDs). Save data as appropriate
(photographically, computer data file, hardcopy, etc.)
F. Interrogate DUT with interrogation tool to download EEPROM
and/or selected PID information (RAM, ROM, EAROM,
EEPROM). Save data as appropriate (photographically,
computer data file, hardcopy, etc.)
G. Re-interrogate with standard scan tool to record scanner data
(DTCs & PIDs). Save data as appropriate (photographically,
computer data file, hardcopy, etc.)
H. If no exceptions, power down and remove DUT.
I. Select next DUT as applicable and repeat steps 1-8. (For subject
DUT, repeat EEPROM download procedure twice.)
J. End test operations.
1 EEPROM = Electrically Erasable Programmable Read-Only Memory.
EEPROM is made by using a special semiconductor construction that
allows it to retain previously stored data even when the battery is disconnected. Flash-memory has similar characteristics to EEPROM, and that
technology is also commonly used to save music or digital camera images
in other commercial devices.
2 Common usage identifies “download” as the process of interrogating an
on-vehicle ECU and recording that data on an external diagnostic ECU
(laptop computer), and that common usage is preserved herein. When
requesting PID information that usage is reasonably applicable. However,
strictly speaking, SAE J2190:4.23 identifies that the process of requesting
the transfer of data from an on-vehicle ECU to an external ECU (Mode
$35) is called an upload request, whereas the process of requesting the
transfer of data from an external ECU to an on-vehicle ECU to an (Mode
$34) is called an download request. Again, to avoid confusion, common
usage is preserved herein.
126
3 Not all electronic data interrogation processes are forensically neutral. A
forensically neutral interrogation is one that will neither add or subtract
error codes (DTCs) or crash data information from any ECU under interrogation. This applies to in-vehicle and bench top interrogation processes,
including ECUs interrogated via direct umbilicals while still mounted in a
vehicle. To be forensically neutral, such a unit must include provisions for
actuator (squib, solenoid, etc.) dummy loads, sensor detection loads, MIL
loads, serial feedback or for seatbelt switch status, so that any ECU undergoing such test-via-umbilical-interrogation will see only a correct operating
environment during power-on and continuous loop checks.
Electronic Data Recorders, Forensic Neutrality, EDR Protocol
C6
The Need for Adequate Strength Seat
Back Design - A Case Study
Kurt D. Weiss, MSME*, Automotive Safety Research, Inc., 5350 Hollister
Avenue, Suite D, Santa Barbara, CA 93111-2326
After attending this presentation, attendees will understand an analysis
of an automobile collision during which a rear seat occupant was ejected
while wearing a 3-point lap and shoulder belt.
humanity by demonstrating how an inadequate seat back design, while certified by federal safety standards, failed and resulted in catastrophic injuries
THEORY OF THE ANALYSIS: Seat back strength is essential in
order to provide adequate protection and containment of occupants in passenger vehicles. Seat back failure as a result of rear-end collisions reduces
the potential for occupant restraint and increases the risk of occupant
ejection. Federal Motor Vehicle Safety Standard (FMVSS) 207 establishes
the requirements for seat assemblies and their attachment hardware to minimize the possibility of component failure by occupant forces acting on
them as a result of vehicle impact. However, real world rear-end impacts
have shown that inadequate strength seat back designs can lead to lack of
restraint and ejection of vehicle occupants.
COLLISION OVERVIEW: On the evening of October 6, 2002, a
young male driver was operating his 2000 model year passenger vehicle at
high-speed. Onboard were passengers in the right front seat and right rear
seat. As the vehicle entered a downhill right-hand turn, the driver lost
control and the vehicle began to yaw counter-clockwise. The vehicle
veered left, crossing the opposing traffic lane, and struck a guardrail at the
roadway edge. The initial guardrail strike was to the vehicle’s right front
corner. The principal direction of force (PDOF) of this impact was approximately 90 right of center. As a result of the right front impact, the vehicle
continued to rotate counter-clockwise and struck the guardrail at the right
rear corner. Rotating through this right rear corner impact, the rear of the
vehicle then impacted a guardrail post. The impact to the right rear corner
along with the rear guardrail post impact had a combined change in velocity
of approximately 12.1m/s with a PDOF of 150 right of center. After separating from the guardrail, the vehicle continued to rotate counterclockwise until it rolled to a stop on the shoulder.
FORENSIC ANALYSIS: Inspection of the seat belts revealed
forensic evidence confirming that all three passengers were wearing their
3-point lap and shoulder belts at the time of impact. In addition, photographs taken by investigating officers show the right rear seat belt still
fastened at the collision scene.
The right rear seat back was deformed due to occupant loading during
the rear impact. In response to this impact and subsequent vehicle rotation,
the right rear occupant ramped up the seat back, sliding under the seat belt,
and was ejected through the rear hatchback window. The ejected occupant
sustained fatal head injuries. The autopsy report revealed this occupant suffered an atlanto-occipital disarticulation, brainstem laceration and contusion, multiple skull fractures, and bilateral cerebral subdural and subarachnoid hemorrhage.
* Presenting Author
The subject vehicle rear seat back is a 50/50 split-back design such
that either half can be independently unlatched and folded forward to
increase cargo space. The latching mechanism for the left and right seat
back panels are located outboard on the interior of the vehicle quarter
panels. There is no restraining device or reinforcing structure at the centerline of the upper area of the seat back, except for a narrow fiberboard
shelf behind the seat that conceals the rear cargo area when the hatchback
is closed.
FMVSS 207 section 4.3.2.2 specifies the acceleration requirements
for the restraining devices of hinged or folding seat backs of forward-facing
seats. The section requires that once engaged, the device shall not release
or fail when subjected to a horizontal acceleration of 20gs opposite to the
direction the seat back folds. Section 5.1.2 of the standard specifies the
testing procedure such that the horizontal force is applied through the CG
of the seat back panel. The right rear seat back panel has a mass of approximately 4.5kg: therefore, at 20gs a total force of approximately 890N would
be applied. Based on the location of the latching mechanism and hinge
point of the seat back panel, the 890N-applied force would subject the
latching mechanism to a force of approximately 672N and the hinge point
to a force of approximately 218N.
A simple haversine analysis was used to determine the peak acceleration of the vehicle as a result of the rear impact. Assuming a collision
pulse duration of 100ms, the resulting peak acceleration was approximately
24.6g. Medical records indicate the right rear occupant had a mass of
115kg, approximately 14 percent greater than the mass of a Hybrid III 95th
percentile male test dummy. The mass and CG location of the individual
torso and upper body components of a 95th percentile ATD were used to
approximate the CG height of the effective mass of the right rear occupant.
The effective mass, approximately 70% of the overall mass, is that portion
of the occupant’s mass that loaded the seat back panel in the rear impact.
The CG height of the effective mass is approximately 30.5cm above the
seat cushion surface. Based on this analysis, the potential peak force
applied to the latching mechanism was approximately 9,200N, and the
potential peak force applied to the hinge point was approximately 8,400N.
The potential peak forces applied to the latching mechanism and hinge
point in the subject collision far exceeded the forces required by the seat
back panel restraining devices to satisfy FMVSS 207. However, these calculated potential peak forces are not unlike those forces reasonably anticipated in real world collisions of this magnitude. Clearly, the seat back
panel and its restraining devices were inadequately designed resulting in
catastrophic failure in this unfortunate collision event.
CONCLUSION: Seat back yield strength is an important consideration in foldable rear seat back designs. Anticipated occupant loading
forces resulting from real world collisions far exceed the static force
requirements used to certify seat back designs. Inadequate strength
restraining devices can lead to seat back failure and increase the risk of
occupant ejection.
Seat Back Strength, FMVSS 207, Occupant Loading
C7
Go-Cart Fatality, Engineering Case Analysis
Adam K. Alexander, PhD, PE*, Aleksander & Associates, PA, PO Box
140558 Boise ID 83714, 5109 North Sawyer Avenue, Boise, ID 83714
The goal of this presentation is to present a typical product liability
case which illustrates many aspects of engineering design for consumer
products, and considers the special requirements and duty of care when the
consumer market includes children.
humanity by demonstrating the complete cycle of consumer product
design, marketing, consumer injury (fatality), litigation, engineering investigation, trial, jury verdict, and government (CPSC) response to remedy the
product by recall. All too often, the process is short circuited by settlements, without addressing the possible latent hazards in consumer
products.
* Presenting Author
Summary/Outcome: This paper presents the findings of an investigation into the circumstances of a go-cart fatality. A 13-year-old girl was
driving a go-cart when her long hair was caught in the rotating machinery
behind the seat. The case (Woodburn v Manco) went to trial, and the
plaintiff’s verdict resulted in a recall of the go-carts. The presentation will
include exhibits from the investigation and trial, with data and commentary.
This typical product liability case illustrates many aspects of engineering
design for consumer products, and considers the special requirements and
duty of care when the consumer market includes children.
The young driver was presented the cart, her brother’s, and instructed
in its use. She was provided with her father’s motorcycle helmet, and tucked
her long braided hair into her T-shirt, and then proceeded to drive the go-cart
in a completely fenced dirt corral. The tire tracks show regular large circles,
about 75 feet in diameter in an unobstructed venue. Her brother, nearby,
investigated when he heard the engine idling for a prolonged time.
Preliminary work included the examination of coroner’s photos that
were taken at twilight and included a cover over the victim.
Photogrammetric techniques were used on an exemplar go-cart to
determine the victim’s actual position in the go-cart. An autopsy was not
performed, and the cause of death was attributed to a neck fracture at C1C2. Further photogrammetric studies helped determine the likely length of
the victim’s hair prior to the accident.
A key element of this case was to establish the likely seating position
of the victim, and the range of positions that the foreseeable go-cart user
population may assume. Exemplars of wigs were used in conjunction with
a subject pool of young and older male and female drivers of varying
statures. The wig enabled a study of the location of the long braided pigtail,
both in a tucked-in location in the driver’s T-shirt, and in the free position,
dangling behind the go-cart seat.
A further study illustrated the foreseeability of long hair in the general
population in both male and female drivers. The evidence presented
showed that the go-cart industry and their component suppliers had a longstanding knowledge of prior scalping incidents involving long scarves, long
hair, and other clothing. However, the testing by the manufacturer and
remedial actions were cursory, incomplete, and ineffective. These included
a recall based on a rear axle entanglement accident.
One of the consequences of the prior cases was the attempt by the
manufacturer to warn the user by means of a label, and instructions. These
Human Factors engineering related issues proved to be inadequate, given
the well understood hierarchy of remedial engineering safety actions,
namely that a warning is not an adequate resolution of a known hazard
when a design change can eliminate the hazard. One of the engineering
aspects of this case was the demonstration that a simple guard, at a nominal
cost was sufficient to eliminate the nip point, the physical root cause of this
fatality. Indeed, after this accident, the go-cart industry adopted a safety
standard that incorporated just such a guard.
The accident itself was linked to the speed of the vehicle, largely
unknown since there were no witnesses at the time. However, a simple
analysis suggests that even at moderate to slow speed the entanglement
occurred in fractions of a second. The neck fracture was thus almost instantaneous. An opposing expert argued that a proper fitting helmet would have
somehow ameliorated the situation, while another offered the opinion that
based on his questionnaires, the girl was operating the vehicle in an unsafe
manner, and that her parents were negligent in letting her drive. This was
part of the defense strategy to allocate blame to the plaintiffs, Idaho being
a comparative fault State, wherein a 50% negligence finding negates any
award in favor of the plaintiffs.
The verdict of the jury trial found in favor of the plaintiff’s, but the
defense succeeded in persuading the jury to find 50% contributory negligence thus negating the damage amount. On the basis of the verdict
however, the Consumer Products safety Commission (CPSC) directed a
product recall in August of 2000 for 91,000 Go-Carts manufactured by
Manco Products Inc., of Fort Wayne, Ind. The jury verdict regarding the
negligence was appealed to the Idaho State Supreme Court, but did not
prevail.
Go-Cart, Human Factors, Anthropometry
127
C8
Momentum and Elastic-Plastic Vehicle
Collisions: A Daubert Accuracy Analysis
Richard W. McLay, PhD*, 1231 Hamilton Court, Iowa City, IA 52245;
and Donald J. Anderson, PE, Anderson Engineering, 8504 Cottagewood
Terrace, Blaine, MN 55434
The goal of this presentation is to present to the forensic engineering
community an analysis of the validity of a momentum and elastic-plastic
model for vehicle collisions to examine the Daubert error requirement.
humanity by examining the theory of three methods for predicting velocity
in accident reconstruction. It makes clear that the method using pre- and
post-impact motion in comparison with the highway witness marks is the
most accurate. As such, it provides a means for guaranteeing the civil rights
of defendants in criminal actions.
This paper will present an analysis of the right-angle impact between
two 4-wheeled passenger vehicles that are defined by their dimensions,
masses, moments of inertia, and vehicle crush. The equations of mechanics
in impact are integrated using a Taylor’s expansion of the impact force,
proving that the error in the mean force is proportional to the time of impact
if the first term in the series is defined by the impulse between the vehicles.
The equations are also shown to be invariant with respect to the impulse on
first integration.
The second integration to yield the displacements at impact is shown
to have meaning only if measurable crush is found on the vehicles. By
using an elastic-plastic model for crush and demonstrating that the elastic
motion is dominated by the plastic crush, closed-form expressions are
derived for both the time-of-impact and the mean force of impact.
The error analysis for the Daubert requirement on accuracy continues
with the developments from the equations of mechanics. By using the
time-of-impact derived from the crush, the angular changes of a target
vehicle of 4105 lbs (1866 kg), moment of inertia of 2285 lb sec ft2, and
bullet vehicles between 1500 lbs (682 kg) and 6000 lbs (2727 kg), shown
in the figure below, were found.
The results for angle changes are shown to yield an error in angle less
than 5o that produces a cosine of 0.996 and a sin of 0.087. This proof
demonstrates that impulsive motion theory can be used to study pre- and
post-impact motion, validating the requirement of Daubert on knowledge
of error.
By using a standard ASTM tensile test for a body part of an American
car, the theory of plasticity is shown to closely approximate a perfectly
plastic steel model, at least for moderate strains near the yield point. The
error induced by ignoring strain hardening is estimated and the resulting
errors in approach and departure velocities are determined for the common
pair of vehicles in the example.
Finally, the chaos in crash testing of vehicles to determine the coefficients of crush is examined relative to the requirements of Daubert. In this
study, the literature has been searched to examine multiple crash tests of
identical vehicles in identical crashes. The theory of chaos is shown to
apply to these crash tests because the deformation of the vehicle in crush is
dependent on small changes in the initial conditions of the crash in both the
structural geometry and in the angles of approach. Chaos appears in the
results because these small changes in initial conditions cause disproportionately large changes in the folding patterns of the vehicle panels and
128
beam supports. As is predicted by the theory of chaos, derived crush coefficients have considerable variation. Even with a large sample size, there
can be no guarantee that a given crash will follow one family of crush parameters over another. It would seem that the finite element method would
yield the best results, assuming that the vehicle is available so that the crush
sequence can be defined and measured. This makes the analysis a deterministic model.
The closure of the paper describes the validation of the theory of the
basic equations of mechanics through the study of impulse-momentum. It
cautions the accident reconstructionist to make sure that predictions for the
motions of the vehicle come from both the witness marks on the highway
(using photogrammetry) as well as any crush and momentum simulation
attempted. Of particular concern is the use of such impact models to
determine speed when it is known that chaos is present in the crash tests
from which crush data are determined. The authors’ conclusion is that it is
better to use the equations of dynamics to study the highway witness marks
than to depend on v calculations of a chaotic system.
Impact, Momentum, Chaos
C9
How Prevalent are Defective
Automobile Air Bags?
Peter K. Alexander, PhD, PE*, Raymond Smith & Associates,
43766 Buckskin Road, Parker, CO 80138
The goal of this presentation is to address questions regarding the
reliability of automobile air bags.
humanity by answering questions regarding the reliability of automobile air
bags.
INTRODUCTION: The automobile air bag is just one part in a
complex electronic and mechanical system designed to inflate the air bag
at the proper moment. Air bag malfunctions can manifest themselves in
four ways. The air bag can deploy for no reason, the air bag can deploy
early or late, the air bag can inflate only partially when full inflation is
called for, or the air bag can fail to deploy when it should have. This paper
addresses only the last issue.
Raymond Smith and Associates is currently working on 4 separate
cases in which air bags failed to deploy. A reconstruction of the collisions
showed that in all these cases, the air bags should have deployed. This
surprisingly large number of failure to deploy cases raises the following
question. Are there a large number of defective air bag systems in the
current vehicle population?
CRITERIA FOR AIR BAG DEPLOYMENT: In general the air
bag should deploy in a frontal or side impact if the speed change induced
by the crash is between at least 15 m.p.h. The air bag should never deploy
at a speed change of less than 9 m.p.h.
The speed change required for deployment with some of the newer
two stage airbags and smart air bag systems that identify whether the
occupant is small and sitting close to the air bag, can be higher.
CRITERIA FOR AIR BAG NON DEPLOYMENT TO
MANIFEST ITSELF: Three things have to happen before an air bag nondeployment event will come to public attention.
1) The air bag system must be faulty
2) An accident must take place, where deployment should have
occurred but did not
3) An injury sufficient to raise the visibility level of the failure,
occurred
The air bag system contains sensors, a microprocessor, the air bag
charge, the air bag, and a significant quantity of electronic circuitry. Due
to the complexity of the system, there can be a large number of reasons for
the air bag not to deploy when it should have deployed. Among the reasons
the system might fail to deploy are the items that follow:
* Presenting Author
• An open circuit or communication failure within the system
• A short circuit within the system
• Sensor drift or improper sensor calibration
• Voltage drift in the power circuitry
• Software malfunction
• A microprocessor malfunction
• A faulty air bag charge
• Environmental issues, such as moisture or contaminant
intrusion during production or while in use
• Poor system maintenance (an error code is displayed, indicating
a problem, but no repair is performed)
THE MAGNITUDE OF THE PROBLEM: A sense of the seriousness of the air bag failure to deploy problem can be gained from examination of the National Highway Traffic Safety Administration’s National
Accident Sampling System Data. Every year the U.S. Government
examines, analyzes, and documents key elements of a sampling of U.S.
vehicle crashes. Most years the sampling contains data from 4,200 to 4,400
crashes.
Selecting from the NASS database one and two vehicle crashes,
which involved frontal impacts resulting in a speed change in excess of 15
m.p.h. produced the data shown in Table 1. This vehicle speed change
should have caused the air bags, in air bag equipped vehicles, to deploy.
Table 1 Air Bag Deployment and Non Deployment Collisions for 2
Injury Levels
YEAR
-Injury Severity COLLISIONS
COLLISIONS
WHERE AIR
WHERE AIR BAG
BAG DEPLOYED** SHOULD HAVE
DEPLOYED
BUT DID NOT
1998
All Injuries
335
8
Serious Injury *
115
1
1999
All Injuries
362
20
Serious Injury
131
5
2000
All Injuries
397
24
Serious Injury
143
2
2001
All Injuries
383
17
Serious Injury
118
4
2002
All Injuries
457
24
Serious Injury
173
6
% OF COLLISIONS
WHERE AIR BAG
SHOULD HAVE
DEPLOYED BUT
DID NOT
2
0.8
5
4
6
1
4
3
5
3
* Serious Injury is defined on the Abbreviated Injury Scale (AIS) as 3 to
5. An AIS 1 injury is relatively minor. AIS 5 injuries are fatal.
** Air bag deployed as a result of the collision
The table shows that, averaged over the 5-year period 1998-2002, the
air bags did not deploy when they should have in 4% of the frontal crashes
involving all injury levels. The non-deployment rate was 2% for crashes
involving serious injury (AIS level 3 to 5).
It should be noted that the NASS statistics only document injuries that
are apparent at the time of the accident. In many cases the seriousness of
an injury may not be recognized for hours or days after an accident. Other
serious injuries may not be well represented in the NASS database because
* Presenting Author
the AIS scale was designed to categorize life-threatening injuries. On this
scale the loss of an eye rates as an AIS 2 injury.
As “smart” air bag systems are introduced, a rise in the nondeployment figures due to an increase in the sophistication and complexity
of the air bag systems may be seen.
If the nationwide percentage of vehicles with air bags that have the
potential to fail to deploy was 4%, it would suggest that among the 170
million vehicles on the road today, there are millions of defective air bag
systems, which will not deploy when needed. This poses a potentially significant risk to the public.
Air Bag, Automobile, Non-Deployment
C10
A Method for Evaluating the Reliability of
EDR Crash Data and Considerations of
Consistency Between EDR Crash Data
and Post-Accident Artifacts
William Rosenbluth, MS*, Automotive Systems Analysis, Inc.,
12015 Canter Lane, Reston, VA 20191
By describing these efforts and methodology, the attendee will learn
the methods of characterizing crash sensor sensitivity. These methods
include an introduction to the identification and analysis of public
accelerometer specifications and to public micro controller specifications
as can be identified from a teardown analysis of the EDR series to be investigated. This analysis is illustrated with an algebraic derivation of EDR unit
data sensitivity using binary and hexadecimal arithmetic. Lastly, the
process to derive a cumulative velocity loss from a hexadecimal crash
record will be shown for an example.
humanity by teaching the attendee to de-mystify the subject of black box
data and black box data analysis by seeing practical examples of technical
analysis. This will allow the attendees to extend their existing forensic
skills, abilities and professionalism by applying them to an area scientific
investigation where pre-2000 skills are often inadequate.
SYNOPSIS: This analysis illustrates a method of evaluating the
reliability crash record data in Event Data Recorder (EDR) and includes a
discussion of the consistency of EDR data with the physically
reconstructed evidence after a collision. The method described illustrates
an engineering analysis to
determine the calibration of
an electronic crash sensor,
and then requires using
series of calibrated acceleration pulses impinged on an
exemplar electronic crash
sensor to document its
response to known input
pulses. These steps allow
the investigator to derive a
calibration transfer function
for the raw EDR data versus a known calibrated acceleration input. Once
the relationship between the saved EDR data and the external calibrated
acceleration pulse is known, the subject electronic crash record could be
evaluated for consistency with the physically documented reconstruction
evidence.
LEARNING OBJECTIVES: By describing these efforts and
methodology, the attendee will learn the methods of characterizing crash
sensor sensitivity. These methods include an introduction to the identification and analysis of public accelerometer specifications and to public
micro controller specifications as can be identified from a teardown
analysis of the EDR series to be investigated. This analysis is illustrated
with an algebraic derivation of EDR unit data sensitivity using binary and
129
hexadecimal arithmetic. Lastly, the process to derive a cumulative velocity
loss from a hexadecimal crash record will be shown for an example.
THEORY OF THE ANALYSIS: The steps required to accomplish
this analysis had to focus on several problems:
Retrieving the Crash-Related Data The first problem to be solved
was to develop the ability to read the crash-related data inside the appropriate event data recorder (EDR). This required a study of SAE and ISO
guidelines and specifications for vehicle networks, and a verification of
which particular sub-specification applied in the instant case. This was
done using several vehicle network analysis tools as a network traffic
monitor for manufacturer/aftermarket scanner equipment doing similar or
partial interrogations. In general, the retrieval development process had to
include:
A. Interrogation of the target EDR so as to obtain the desired electronic information [e.g., EEPROM/Flash-memory hexadecimal data]. This
information is often enclosed within interrogation commands and
responses, not part of the actual desired information.
B. Parsing is the next step. Parsing is the process of extracting the
desired electronic information from within the undesired interrogation
commands and responses.
C. Formatting, the next step is the process of assembling the parsed
data into a structured format so that it can be easily read and interpreted.
This often involves adding address identifiers and spaces between data elements.
D. Translation is the fourth step, is the process of performing an
evaluation of the address-identified data elements into meaningful engineering units. Data element translation is usually accomplished in accordance with a standard specification such as SAE J2178-2, SLOT instructions [scaling, limits, offset and transfer function guidelines]. Meaningful
engineering units allow the investigator to report such parameter facts as
acceleration, timing, seatbelt usage, instantaneous velocity change, cumulative velocity change, etc.
E. Interpretation of the translated data is the fifth step. Data interpretation involves evaluation of the reported and translated data with
respect to their consistency with complementary investigator findings and
conclusions [e.g., reconstruction, bio-mechanics, human factors, etc.].
Deriving a Scaling and Transfer Relationship From the Data. A
standard for interpreting ECU data hexadecimal values is given as an SAE
SLOT definition for the parameter saved at that address, so that the ECU
data can be readily interpreted and used for engineering analysis. In
general, information for specific ECU SLOT definitions is not publicly
available, so it was required to open the appropriate ECU and photographically document its componentry, specifically, its accelerometer and its
micro controller. An example of such a photographic documentation is
shown in Figure 2.1. Once the key components are identified, as in this
case, industry specifications will reveal the SLOT factors specific to those
components. As a tutorial example,
A. We assume that the micro controller used an 8-bit A/D converter
with a 5,000-volt reference.
B. We assume that the accelerometer used has an output sensitivity of
40G/volt, or 1G/0.0250 volt or 0.0250 volt/1G.
C. We assume that acceleration A/D counts are represented in EDR
memory where each byte (8 bits) is a separate value.
For an 8-bit A/D converter as assumed above, it is known that its
hexadecimal count range is $00 to $FF (0 dec to 255dec). It can be determined (from manufacturer public specifications) that its full count (255
dec) represents 5.000 volts and that it is a linear radiometric device. Thus,
each linear count represents 5.000/255 volts or 0.0196078 volts.
For the accelerometer assumed above it can be determined (from
manufacturer public specifications) that its nominal sensitivity of that
device is 0.0250 volts/G or 1G/0.0250V.
130
Using those two data specifications, the subject EDR data byte acceleration data sensitivity can be calculated as:
for each byte of an acceleration record.
Some EDRs report their crash-related data in units of direct acceleration per
time period (a(t)), some report units of averaged acceleration per time
period <a(t)> and others report their data in units of cumulative velocity
change per time period time (_ v(t)) . Of course, for any unit time period
(tp), the period velocity change, v(t) is no more than the product of a(t) tp,
thus, any subsequent validation of EDR Delta V analysis is really validating
the analysis of acceleration recording capability. The above discussion
assumes that a reasonably complete crash pulse function is being analyzed.
However many EDRs may report their data as a different function that
incorporates only a portion of, or derivative of, a(t) or v(t). One such value
that may be reported is the cumulative velocity at the time of a deploy
command, _ v(t)|at fire command. Next the methods and tests to determine
and/or confirm such relationships are explored.
Conducting Tests to Verify the Above Analysis The ultimate validation of any theoretical analysis is a physical trial of the analysis theory.
In this case such a trial consists of impinging a known calibrated acceleration pulse on an EDR and then comparing the EDR record with the known
input pulse. For confidence this must be done over several calibration
levels around the pulse magnitude of interest. Additionally, if the data
acquisition system used to record the impinged acceleration pulse also
records an air bag/pre-tensioner squib fire pulse, the time relationship from
EDR acceleration record start to squib firing decision can be documented
(for the test input acceleration pulse). An example of one of the calibration
trial (from a process of several such trials) is illustrated the sequence of
Figures 3.1, 3.2, 3.3, 3.4, 3.5. This figure sequence shows the accelerationimpingement fixture, the external recording accelerometer, the external
acceleration record, the EDR acceleration record, the superposition of the
EDR record on the external acceleration record and the squib fire pulse
resulting from that external acceleration input. Lastly, Figure 3.6 shows a
superposition of the (calculated) cumulative velocity changes for both the
EDR and the external acceleration pulse. That superposition shows that the
cumulative velocity changes are essentially congruent (thus proving that
the EDR is recording a true representation of the input pulse that it was
impinged upon it. Additionally, the time value data for the start of squibfire time shown on Figure 3.5 is also called the time of deploy command.
This time can be applied to Figure 3.6 to determine the cumulative velocity
change at the time of the deploy command, _ v(t)|at fire command.
The above example illustrates a reasonably complete example for a
substantially complete whole crash-event. However, a similar analysis
could actually illuminate a sub-event. Postulating the sub-event as a whole
event would be incorrect. Thus the investigator must consider the consistency and plausibility of the physical reconstruction assessment of the
ensemble event with every EDR record analysis. Examples of plausible
and implausible EDR analyses are shown to assist the investigator in future
such determinations.
* Presenting Author
C11
Multi-Variable Measurement and
Comparison of Rear-Impact Head/Neck
Injury Risk for Motor Vehicle Seats
Kenneth Saczalski, PhD*, 1440 West Bay Avenue, Newport Beach, CA
92661; Mark C. Pozzi, MS, 8 Paul Road, Cedar Crest, NM 87008; and
Todd K. Saczalski, BS, 1505 Verde Valley School Road, Sedona, AZ 86351
Electronic Data Recorders, EDR Analysis, Crash Data Analysis
* Presenting Author
The goal of this presentation is to present a test protocol, and results,
for objective measurement and comparison of motor vehicle seat safety
system performance, as it relates to rear-impact head/neck injury risk
factors for various size occupants subjected to a high-low range of impact
severities (i.e. whiplash range up to 50 kph rear-impact levels).
humanity by demonstrating the multi-variable, high-low impact, “side-byside” test protocol, with full vehicle interiors, which provides a more
accurate means for comparing vehicle safety system performance as it
relates to occupant injury risk measures.
Prior studies dealing with evaluation of rear-impact head and neck
injury performance of automotive seats have suggested that the more
common, but weaker, single-recliner (SR) seat designs (i.e. about 3.2 kN
strong), which tend to collapse rearward during rear impact, provide
improved occupant protection over the much stronger and available “beltintegrated” seat (BIS) designs (i.e. about 14.5 kN strong), for impact
severities ranging from low velocity “whiplash” levels (i.e. 17 kph or less)
on up to more severe rear impacts of 40 to 50 kph. It has also been
suggested in these studies that out-of-position (OOP) occupants in the
stronger BIS designs are at greater risk of injury than if they were seated in
the weaker SR seat designs. Unfortunately, these studies did not test the
weaker seat performance within the full constraints of the vehicle interior
and rear occupant space. These constraints include, among other things,
non-yielding rear seatbacks, limited rear occupant space, hard rear surface
structures like package shelves, and rear occupants themselves (such as
children and infants). Also, other factors that are not likely to affect the BIS
design, but can further degrade the performance of the collapsing SR seats
(such as intrusion of rear seatbacks, vehicle pitch/yaw motions, and offset
rear impact) have not been examined in these earlier studies.
This current study evaluates head and neck injury performance of
each seat design by using a complete vehicle interior, with “side-by-side”
testing of both the typical collapsing SR and strong BIS designs, for 3 sizes
of restrained surrogates subjected to a “high-low” range of rear impact
severity. Neck injury performance is based on the “percent risk of AIS
(Abbreviated Injury Scale) 3+ injury” derived from the NHTSA (National
Highway Traffic Safety Administration) combined load “Nij” values, calculated from the measured surrogate response. Head injury risk is based
upon the HIC (Head Injury Criteria) curve for “percent population at risk
of AIS 4+” head injury.
A typical 4-door family sedan vehicle, with full interior, was used as
the baseline vehicle. Both “sled-body buck” tests and 2 complete “vehicleto-offset barrier” pole impact tests were used. A total of 3 sled-buck tests
were run at a low “whiplash” severity level (17 kph) and 6 were run at the
severe high impact velocity change (50 kph) (repeat tests were run at the
high impact levels). The crash pulse applied to the body-buck system was
matched to the crash pulse of the actual vehicle. Three occupant sizes (i.e.
5th Female (50 kg), a 50%tile Male (80 kg), & a large Male (50%tile Male
ballasted to 110 kg)) were tested for each of the 2 velocity change levels.
Each surrogate was instrumented with head, upper neck and chest instrumentation. Lap belt loads were also measured. In all cases the surrogates
were leaned forward “out-of-position” (OOP) from the headrests with a gap
of 5 to 6 inches, to examine effects of occupants in non-optimum seating
positions for both seat types (SR and BIS). The effects of “rear seatback
intrusion” and “vehicle pitch” that could adversely effect the weaker SR
seat were excluded in the “sled-buck” tests, so that it would be possible to
evaluate the collapsing SR seat performance under optimum conditions.
Ultimately, the adverse effects of rear seatback intrusion, etc, were
131
evaluated with the actual “vehicle-to-barrier” tests. These tests were run at
the high severity level, with the heavy surrogate in the weaker SR driver
seat in one test, and the other test run with the heavy surrogate in the BIS
version of the driver seat. In some of the sled-buck tests a 6-year-old
surrogate was placed in the rear bench seat to study other hazards of the
collapsing SR seat design.
The data and results of the “side-by-side” seat tests are summarized in
several tables. Included in each table is a category for “% Risk of AIS 3+
Neck Injury Potential,” and “% Population at Risk of AIS 4+ Head Injury.”
What the results indicate is that for the strong BIS design there is no
significant risk of head, neck or chest injury at either the “whiplash” 17-kph
levels or the more severe 50-kph range. On the other hand, the weak SR
seat demonstrates “serious and dangerous” risk of head and neck injury in
the “severe” 50-kph ranges, for all size occupants, even with optimum
headrest height and no adverse rear seatback intrusion or vehicle pitch/yaw
effects. Also, common vehicle mounted belts were ineffective in
restraining all size occupants in the collapsing SR seat design at high severities. Finally, the effects of rear seatback intrusion, and vehicle pitch/yaw,
as well as impact offset, clearly increases the injury risk factors for the SR
seat, but have virtually no deleterious effect on the BIS designs.
Rear-Impact, Motor Vehicle Seats, Head/Neck Injury Risk
C12
A Semi-Trailer/Ambulance Collision on a
Dark and Icy Night: Proof of a Bizarre
Bounce Contradicts Witness Statements
and a Police Report
Joseph A. Keierleber, MFA, MTC Forensics, 54 Pleasant Avenue, Peaks
Island, ME 04108; and, Thomas L. Bohan, PhD, JD*, MTC Forensics,
54 Pleasant Avenue, Peaks Island, ME 04108
The goal of this presentation is to describe an unusual motor vehicle
crash in which misleading eyewitness statements and a careless police
report nearly obscured the true cause of the collision. In addition to being
an object lesson in the unreliability of eyewitnesses, this case should also
serve to instruct attendees on how conclusive statements, even those of
official police reports, may be the result of prejudice and uncritical
thinking. Finally, it will reemphasize the rewards of iterative investigation
techniques.
humanity by demonstrating the importance of continued analysis followed
by reexamination of physical evidence suggested by that analysis is an
essential part of the forensic process and can yield big returns.
The Crash: A northbound ambulance on an emergency run with its
blue lights activated collided at highway speed with the side of a southbound semi-trailer hauling 45,000 pounds of paper. The ambulance came
to rest in the middle of the highway, rotated about 90 ccw and the tractortrailer came to rest alongside the snow bank lining the southbound side of
the road, with the rear of the trailer several feet into the snow bank.
Road Conditions: The highway sloped downward from north to
south. The temperature was near freezing, with a drizzle falling and
freezing along the portion of the road to the north of the crash site, but not
to the south, from where the ambulance was coming.
Driver Statements: (1) The ambulance driver stated that as the
ambulance approached the tractor-trailer the latter jackknifed, its trailer
swinging around to block the northbound side of the road all the way to the
guardrail. (2) The truck driver said that he had slowed and pulled to the
right when he saw the ambulance approaching and just after the ambulance
had passed him he heard a crash and, looking back, saw that the ambulance
had run into the side of his trailer, which was tracking directly behind the
tractor.
Eyewitness Statements: All four persons from abutting residences
who came forward were insistent that it was the fault of the ambulance
driver. The witnesses depicted the ambulance as traveling at a high rate of
132
speed and veering into the truck, which they said was traveling slowly and
entirely in its own lane. A northbound driver said that the ambulance lost
control after passing a vehicle at a high rate of speed, after which it crashed
into the trailer, which was in its own lane of travel. Another driver, who
disappeared right after the crash, said that the tractor-trailer had jackknifed,
causing the crash.
Police Report: The crash occurred in early evening, after dark. The
local police investigator concluded that the ambulance had caused the crash
and so stated to the region’s newspaper, which ran a story to this effect,
amplifying it with accounts of the repeated complaints reportedly made by
residents concerning ambulances speeding past their houses. It also
included the erroneous police statement that the speeding ambulance was
just returning to its home station and not on an emergency run.
Physical Evidence: The most striking physical evidence was a
50-foot stretch of chewed-up guardrail on the northbound road edge was
chewed-up. The top of the guardrail was originally a few inches higher
than the bottom of the anti-underside bumper (ICC bumper) on the trailer.
That bumper showed massive damage to all areas and it was clear that it
had been struck either by the ambulance or by the trailer tires, the carriage
for which had been dislodged from its mounts on the trailer’s underside.
The damage to the trailer, including paint transfer, showed that the ambulance had struck it approximately in the middle and then had slid along it
until coming into contact with the trailer’s front left outboard tire. (The
trailer had dual tandem axles positioned near its aft end.)
The ambulance displayed massive damage to the front left quarter
extending back to the region behind the driver’s seat. There was essentially
no damage to the right side of the ambulance.
The Problem: Although the guardrail damage upstream from where
the vehicles came to rest strongly suggested that the truck had indeed jackknifed, the adamant statements of the witnesses initially cast doubt on that
point. One of the witnesses even asserted that the ambulance post-impact
caused the chewed up guardrail. However, a careful examination and reexamination of the ambulance turned up no portions of it that could have
ridden the rail in the fashion required for that damage. The police report
did not take that damage into account at all; by his own admission, the
investigating officer never examined it closely. He was willing to say that
both vehicles were slightly over the centerline and that the responsibility
was therefore evenly divided.
The biggest sticking point to explaining the crash as resulting from the
jackknifing that blocked the ambulance’s path was the lack of damage on the
right side of the ambulance. If the crash had occurred with the trailer’s aft
portion riding the guardrail, it would seem that the ambulance would have
been forced into the guardrail; yet there was no marking on the ambulance
to suggest that it had hit the rail at all. Also, it was not clear that the impact
of the ambulance against the trailer would have provided the momentum
necessary to swing the trailer back off the road on the other side.
The Solution: The road was so slippery at the time of the crash that
the vehicle dynamics were akin to air table physics. If the truck had been
jack knifing so as to bring the ICC bumper into contact with and past the
guardrail on the opposite side of the road, the swinging of the trailer would
not have stopped at that point, but would have continued so as to bring the
outer sidewall of the trailer’s left rear-most tire into contact with the
guardrail. When that tire was re-examined, two horizontal wear lines at the
height corresponding to the heights of the two guardrail protrusions were
found. The portions of the rim corresponding to the respective centers of
the two wear marks were scored in a way consistent with them having
rubbed against the steel guardrail. The fact that there were two discrete
wear bands had been overlooked before because of paint in the same area
of the tire. Also, a faint black discoloration of the guardrail was found
toward the south end of the chewed-up section. As it turned out, the impact
between the front left outboard tire and the ambulance had forced the two
left-side axles together so that none of the trailer tires could rotate following
the impact. It was for this reason that the two parallel scuffmarks remained
horizontal to the ground.
This additional evidence of contact between the trailer and the
guardrail made it clear that when the truck driver slowed and pulled to the
* Presenting Author
right because of the approaching ambulance the trailer tires locked up on
the very slippery surface, resulting in the jack knife. The jack knife went
unnoticed by the truck driver, who was intent on the approaching ambulance. Meanwhile, the jack knife continued, the trailer tires not rotating,
until the rear end of the trailer hit the guardrail on the opposite side, ultimately bringing its rear, left tire into contact with the rail. The swing continued, causing the tire to be compressed, until the rim came into contact
with the rail, halting further swinging. When the swinging ceased, the
trailer moved outward from the rail as the result of the force of the compressed tire on the rail. Making reasonable geometric assumptions about
the compression, as well as the physical assumption that that part of the tire
away from the rail did not change in shape, the reduction in volume of the
tire could be estimated. The kinetic energy given to the trailer by its tirerelated rebound from the rail was then equated to the tire pressure (which
would have remained essentially unchanged because of the small relative
volume change) multiplied by the change in volume as the tire pushed
outward
W = p ∆V.
This quantity turned out to be approximately 1,200 ft-lb, which in
light of the trailer weight and moment of inertia about the fifth wheel, indicates that during the rebound the end of the trailer initially moved away
from the guardrail at a speed of about 10 feet/second. As a result, an
opening appeared between the trailer and guardrail by the instant of impact.
In addition, the trailer was swinging away from the ambulance’s lane at the
time, and as a result of these two factors, the collision did not force the
ambulance into the guardrail. Furthermore, this explains why, when the
truck driver heard a bang after passing the ambulance, he looked back to
see his trailer tracking behind the tractor. Finally, this explains how the
trailer fetched up in the snow bank along its own side of the road, which
was part of the basis for the witnesses and police investigator being convinced that the truck could not have been at fault.
Accident Reconstruction, Jackknife, Eyewitness
C13
Forensic Testing and the Characteristics
of Seat Belt Webbing Force Limiting
Expansion Loops
Kurt D. Weiss, MSME*, Automotive Safety Research, Inc., 5350 Hollister
Avenue, Suite D, Santa Barbara, CA 93111-2326
of seat belt force limiting expansion loops, the associated testing methodologies, and the force-displacement characteristics of several designs
incorporated in late model vehicles.
humanity by demonstrating expansion loop characteristics and providing
several data points useful in analyzing vehicle occupant interaction with the
seat belt system.
THEORY OF THE ANALYSIS: Seat belts remain the primary
occupant restraint system in passenger vehicles. In the event of a collision,
3-point lap and shoulder belts help to reduce the risk of injury due to
impacts with interior components or ejection. Seat belts offer ride-down by
providing restraining forces early in the collision event, thereby decreasing
the relative velocity between the vehicle and occupant. Seat belts also help
distribute restraining forces over the skeletal areas of the body.
In an effort to modify occupant kinematics and to reduce the injury
producing restraining forces, seat belt designs often incorporate expansion
loops. An expansion loop is a commonly used force-limiting device
whereby the seat belt webbing is folded along the short axis, and stitched
in place by parallel rows of threading. The thread material and stitch
pattern used to make the rows of stitching will tear at predetermined
webbing tension levels. When the stitches tear, the webbing fold will open
* Presenting Author
thereby lowering the tension in the webbing. A warning label is often
visible after the stitches tear. Replacement of the seat belt assembly in this
condition is strongly advised.
Testing was conducted on new and used front outboard seat belt
assemblies of three different vehicle models to evaluate the percent
elongation of the webbing, and to determine the force-displacement characteristics of the expansions loops. The instrumentation and scientific
methodology used were typical and standard for this type of forensic testing
and data acquisition.
SEAT BELT WEBBING TEST SET-UP: 14 type 2 seat belt assemblies were obtained for testing. Six new assemblies were purchased from
local dealers, and eight used assemblies were obtained from salvage
vehicles. Preparation of the samples included separating the webbing from
the retractor mechanism. The rubber-like escutcheons that often encase the
expansion loops were preserved and left intact for use in the second of two
test series.
TEST SERIES: Two series of tension tests were conducted. The
first series (Series A) contained 14 tests, one test per webbing sample. The
test protocol was designed to determine the percent elongation of the
webbing, and did not include the effect of the expansion loop. Webbing
samples tested were sectioned from the portion of webbing nearest the seat
belt retractor.
Webbing ends were held by split drum grips of the type specified
under Federal Motor Vehicle Safety Standard (FMVSS) 209. One split
drum grip was rigidly anchored to the test bench, while the other grip was
secured to the crosshead of the test machine. Tension in the webbing was
applied by raising the crosshead. A webbing pre-load of approximately
222.4N was used. The grip separation rate was 51mm per minute. The
force was measured by a load cell. Elongation of the webbing was determined with a laser extensometer, as well as with an engineering scale, when
the tension in the webbing rose to 11,120N.
The second test series (Series B) contained 14 tests, one test per
webbing sample. These tests were performed to evaluate the forceextension characteristics of the expansion loop of the lap belt. The webbing
section tested in this series was the portion nearest the outboard lap belt
anchor. One end of the sample was secured to the test bench using the
existing anchor bracket to which the webbing was sewn. The expansion
loop remained concealed in its rubber-like escutcheon to maintain the
original in-vehicle condition.
The other end of the webbing sample was held by a split drum grip
attached to the test machine crosshead. The grip separation rate was
100mm per minute, a rate commonly used by the seat belt manufacturing
industry. Force was measured with a load cell. The peak force to tear each
row of stitching was determined. As tension in the webbing sample
increased, the rows of stitching in the expansion loop subsequently failed.
As the rows of stitching were torn, tension in the webbing decreased as a
small amount of webbing was added to the sample overall length. This
phenomenon produced a saw tooth-like force-displacement curve. Sample
testing was stopped after all rows of stitches were completely torn.
TEST RESULTS: The results of Series A varied by vehicle model.
For new samples, the webbing elongation was between 5.2% and 14.8%
using the laser extensometer, and between 5.9% and 13.6% using the engineering scale. For used samples, the webbing elongation was between
5.5% and 11.4% using the laser extensometer, and between 5.8% and
10.7% using the engineering scale.
The results of Series B were dependent on the expansion loop design,
i.e. by the fold pattern, the number of rows of stitching, the thread material,
and the stitching pattern. One expansion loop design added an average
218mm of webbing at an average peak force of 2733N for new samples
tested. The used samples added an average 267mm at an average peak
force of 1900N.
Another expansion loop design added an average 238mm of webbing
for the used samples. The first three rows of stitching yielded at an average
peak force of 5067N and the remaining rows yielded at an average peak
force of 3244N. The testing of the new sample in this vehicle model
133
resulted in a failure of the webbing during the test. The results of this
sample were suspect and therefore not included.
The last expansion loop design added an average 248mm of webbing
for the new samples. The first three rows of stitching yielded at an average
peak force of 5910N and the remaining rows yielded at an average peak
force of 4225N. For the used samples, an average of 231mm of webbing
was added. The first three rows of stitching yielded at an average force of
4943N, and the remaining rows yielded at an average peak force of 3600N.
CONCLUSION: Expansion loops are often incorporated in seat belt
designs to modify occupant kinematics and reduce occupant-restraining
forces during the collision event. Expansion loops vary among vehicle
models and each design exhibits unique force-displacement characteristics.
Forensic testing of seat belt expansion loops can be used to quantify the
force necessary to break the stitching and measure the amount of additional
webbing added to the seat belt assembly. Subsequent testing results will be
offered in future publications.
Seat Belt Webbing, Force Limiters, Expansion Loops
C14
Truck Unloading Caused Fatal Bunker
Retaining Wall Tipover
Thomas L. Boyer, PE*, and John A. Talbott, BS, PE, Talbott Associates,
Inc., 7 Southeast 97th Avenue, Portland, OR 97216-2498
The goal of this presentation is to illustrate the investigations,
measurements, testing and analysis, which determined the cause of a
bunker wall overturning and resulted in a large settlement for the
decedent’s estate.
humanity by demonstrating a methodology for analysis of unusual interactions of vehicles and structures, which may usefully be applied to other
events of similar character.
A company in Molalla, Oregon, specialized in preparing and selling
bagged bark dust and other soil amenities. The bulk bark dust was received
from a single supplier, who delivered the bark dust in tractor-trailers. The
bark dust was stored in open-top bunkers constructed of concrete blocks
2’ x 2’ x 6’ with an interlocking tongue-and-groove which were stacked on
the asphaltic concrete to provide the sidewall enclosure into which the
trucks unloaded. The semitrailers had “walking floor” live bottoms for
self-unloading. One of those bunkers was fairly close to a metal building
on the property, and because there were no other sanitary facilities close by,
there was a “Port-a-Potty” situated between the retaining wall of the bunker
and the metal building.
The standard procedure was for the truck driver to back his truck up
so that the trailer was about 6’ from the wall of the bunker and then for him
to wait for an observer from the processor’s crew to stand by and watch the
unloading and then to release the tailgate and release the brakes and begin
the unloading process. The live bottom of the semitrailer would slowly
move the bark dust cargo rearward, forcing the top-hinged tailgate open,
and depositing the chips on the asphaltic paving in the bunker. Then, as the
expelled cargo mounded behind the trailer, the tractor and semitrailer
would be forced forward, allowing the mound to grow forward. At
completion of unloading, the tractor-trailer would be driven forward to
allow the tailgate to clear the mound and close.
The paper demonstrates a methodology for analysis of unusual interactions of vehicles and structures, which may usefully be applied to other
events of similar character. On the occasion of the accident, a woman was
in the Port-a-Potty; an observer from the processor’s crew was not immediately available, and the truck driver decided to proceed with unloading
anyway. As the unloading proceeded, the wall of the bunker tipped
outward, partially crushing the Port-a-Potty against the building and
exerting such pressure on the woman who was then standing that she was
asphyxiated by compression of her chest and abdomen. The question was
why the wall tipped.
134
Talbott Associates visited the site, measured the blocks of which the
wall was formed, and measured the slope of the asphalt surface over which
the tractor would have passed during its unloading. There was observed no
foundation or soil failure. Next, the truck was examined at the supplier’s
yard, loaded in the manner and to the extent of the subject case. The slope
of the drive on which the truck was situated was measured along its full
length, and then with its brakes released, it was pulled by another truck
while a dynamometer measured the force required to cause its motion. The
trailer’s top pivoting tailgate was measured, as were the general tractortrailer dimensions. Observation was made of concrete abrasion marks on
parts of the trailer gate.
Samples of the different grades of bark dust were taken and were used
to determine its density and coefficient of internal friction, shear strength,
and its lateral pressure coefficient.
Because the bunker wall had been moved and replaced since the
accident, no artifacts of the accident were discoverable on the wall itself.
Structural analysis of the stability of the concrete wall revealed that it
had a huge factor of safety against overturning for retaining the bark dust
and wood chips. Further analysis revealed that if the tailgate did not
contact the wall, the force that could have been exerted through the chips
could not have been enough to tip over the wall. Analysis also indicated
that even if the tailgate had made contact with the wall, the geometry and
mechanics of the unloading bark would provide a forward horizontal force
on the trailer which exceeds the rearward horizontal force at the tailgate to
wall contact. If the brakes of the tractor and trailer were released, the force
required to move the trailer forward and thus the force applied to the wall
was found to be insufficient to cause a tipover of the wall even with the
combined effect of the lateral pressure of the chips against the wall.
Therefore, the conclusions were that the trailer was stopped too close to the
wall, the brakes were still applied, and the unloading proceeded without the
driver watching the process and without the observer, which was required
by the normal procedure.
A videotape of an unloading procedure taken by the Oregon
Occupational Safety & Health Administration was reviewed, and computerized animations were performed to illustrate the process of the accident.
Suit was filed on behalf of the estate of the decedent woman, and after
the defendants’ counsel’s viewing the animation and other evidence; a substantial offer in settlement was proffered and accepted.
Unloading, Wall, Tipover
C15
Determination of Driver Identity in a
High-Speed Vehicle Rollover: Vehicle
Occupant Injury Patterns and Vaulting
Velocities Correlated With Safety Defects
and Accident Reconstruction
Mark C. Pozzi, MS*, Sandia Safety Sciences, 8 Paul Road, Cedar Crest,
NM 87008; and Todd K. Saczalski, BS*, TKS Consulting, 1505 Verde
Valley School Road, Sedona, AZ 86351
After attending this presentation, attendees will understand forensic
science techniques for determining vehicle occupant trauma pattern and
vehicle collision damage, and correlation of this with scene evidence,
vaulting velocities and vehicle dynamics, to assist in determination of
driver identity. Attendees will also understand the application to general
biomechanics, accident reconstruction, vehicle safety investigation, static
and dynamic test techniques and evaluation.
humanity by demonstrating a new method of utilizing static and dynamic
testing as well as previously conducted non-case-related tests to determine
critical factors in accident reconstruction, especially for determination of
driver identity. Determination of driver identity is a well-recognized
* Presenting Author
demand for law enforcement, prosecutors, insurance companies, accident
investigators, and medical examiners. A wide variety of forensic evidence
identification and analysis techniques were utilized in this investigation,
which occurred several years after the event.
LEARNING OBJECTIVES: The authors will present reliable
forensic science techniques in analyzing trace evidence from photos,
medical records and physical examination of a vehicle and accident scene.
Via the scientific method, demonstrate vehicle safety failures, as well as
how to utilize available test information to determine performance of
vehicle subsystems and components in a unique collision.
PROPOSITION: Via the scientific method, show correlation
between specific vehicle damage, occupant vaulting energy, and occupant
injury, at specific points during a high-speed rollover event, as a reliable
means to determine vehicle occupant identity.
SYNOPSIS: A forensic case study is evaluated which involves a
single-vehicle high-speed fatal rollover accident with both occupants
ejected. It was initially unknown which occupant was driving the vehicle,
despite investigation by the state police and the regional medical examiner.
The surviving occupant was severely brain injured with no memory of the
accident. There was no witness to the rollover, which involved extensive
off-road vehicle travel with significant vertical increase in elevation,
followed by falling down a rocky cliff. No fingerprints, hair, blood, skin
smears, fibers, fabric transfer, or other organic samples were positively
identified.
Mud deposits on the vehicle interior and the lack thereof on one
occupant’s shoes, as well as specific evidence (or lack thereof) involving
steering column, dash, control pedals, windshield, seats, seat belts, door
interiors, side and rear windows, and headliner were analyzed and
identified by the authors on the vehicle interior. Evidence (or lack thereof)
on door latches, door structures, door window openings, exterior sheet
metal, exterior mirrors and trim, axles, and numerous other exterior vehicle
structures was analyzed and identified by the authors.
The occupants were ejected from different vehicle portals, at different
locations, as a synergistic result of restraint system failure, seat failure, and
door latch failure, correlated with vehicle collision and rollover dynamics.
Occupant trauma pattern and severity was determined from photographs
and review of autopsy and medical records. Occupant trauma
pattern/severity and vehicle dynamics were accurately matched to vehicle
interior and exterior evidence, occupant vaulting velocities, as well as
occupant and vehicle final rest positions. The foregoing was correlated to
evidence deposited by the vehicle, as well as each of the vehicle safety
failures, to determine which occupant was ejected from which portal, at a
specific place and time.
Static and dynamic testing by the authors and others was correlated
with dynamic vehicle collision and rollover mechanics to also prove
occupant ejection dynamics, occupant injury or lack thereof, and occupant
location within the vehicle. This involved use of: A) Static and dynamic
seat tests to determine that a specific seat was unoccupied at a certain point
in the rollover event. B) Dynamic crash and sled tests to prove restrained
and unrestrained occupant kinematics, injury level and restraint system
failure. C) Static seat belt tests with human surrogates to determine likelihood of restraint system use by a specific individual.
The vehicle rollover path was accurately matched with location and
type of each significant collision/ground contact, vehicle exterior damage,
and vehicle parts/debris deposits. Each significant collision/ground contact
was then correlated with vehicle velocity and safety failures as well as
occupant ejections, vault velocities and trauma patterns.
SUMMARY/CONCLUSION: Reliable, positive identification of
the driver was made via multiple cross-correlation of all the foregoing
evidence with biomechanical and vehicle dynamics analysis. What may be
a new technique of correlating static and dynamic test data to a specific
real-world crash event was developed.
Biomechanics, Reconstruction, Rollover
* Presenting Author
C16
Conspicuity vs. Visibility in
Accident Reconstruction
James B. Hyzer, PhD*, Hyzer Research, 1 Parker Place, Suite 330,
Janesville, WI 53545-4077
The goal of this presentation is to show that the conspicuity of a
hazard is a critical factor in reconstructing the visibility aspects of a
collision between a vehicle and a hazard.
humanity by demonstrating a better understanding of conspicuity and visibility in reconstructing the visibility aspects of vehicle/hazard collisions.
The objective of this paper is to discuss and analyze the factors that
affect a driver’s ability to visually perceive and then recognize hazards such
as pedestrians, objects, and obstructions ahead under varying conditions of
background clutter. The outcome will be to show that the conspicuity of a
hazard is a critical factor in reconstructing the visibility aspects of a
collision between the vehicle and the hazard.
A common cause of roadway accidents is the driver not seeing a
hazard in time to respond and avoid collision. It is not uncommon for
drivers who have hit pedestrians, for example, to report that they “heard the
thump but never saw him” or that they “didn’t see him until it was too late.”
When presented in court, the outcome of the case may depend on whether
the jury believes the driver’s testimony or concludes that since the pedestrian was in plain sight, the driver must be lying. The job of the expert,
then, is to determine whether the signal value of the struck pedestrian was
sufficient relative to the driver’s visual field to assuredly capture the
attention of all reasonable alert drivers exercising ordinary care with respect
to lookout in time to enable them to respond in time to avoid collision.
Through a review of published scientific literature, it will be shown that it
does not follow that simply because a pedestrian, obstacle or obstruction is
in plain sight that it will necessarily be perceived as a hazard and responded
to in time by all reasonable alert drivers.
Under low-light-level and/or nighttime conditions, and at locations
with no or minimal background clutter or visual confusion (e.g., rural
settings), the visual perception and recognition of a hazard in the roadway
simply requires that it be either more or less luminous than its immediate
background and have a sufficient luminance and contrast to be distinguishable from its background. Contrast is related to the difference in the
luminance of an object of interest and the luminance of its immediate background. Contrast sensitivity is quantitatively equal to the reciprocal of
contrast threshold and represents a measure of an observer’s ability to
discriminate different levels of contrast. The contrast sensitivity of the
human visual system decreases with age and with lower light levels.
Other factors that need to be considered in determining the visibility
of a hazard under low-light-level and/or nighttime conditions are such
things as observer expectancy, the age of the observer, exposure time,
disability glare, light adaptation, purkinje effect, positive vs. negative contrast, headlight beam-pattern, and the relative geometry of the driver and
headlights with respect to the hazard.
Under daytime and nighttime conditions at locations with significant
background clutter and/or visual confusion, hazards can be perceived and
recognized when they differ from their surroundings in such aspects as size,
shape, luminance, color, motion, texture or some other visual disparity.
Conversely, hazards that are visually identical to their surroundings cannot
be seen or recognized and are said to be perfectly camouflaged.
To correctly express these concepts to a jury, it is important to understand the relevant terminology as it relates to visibility. To detect an object
means to discover or determine its presence. A detected object that is also
a hazard, however, may not necessarily be recognized as a hazard. To see
the object, simply means to perceive it by the eye or by vision. To perceive
it means to become aware of its presence through the senses (here by
vision). An object is visible if it is capable of being seen. An object is conspicuous if it attracts or tends to attract the attention of an observer so as to
be readily discovered by vision. Conversely, an object is inconspicuous if
135
it is not readily noticeable or discoverable by vision. The term conspicuity,
then, is the capacity of an object to stand out in relation to its background
so as to be readily discovered by vision
Even though a hazard may be in plain sight and visible, it must be conspicuous relative to its surroundings to be seen in sufficient time by all
drivers. Hazards that are more conspicuous are going to be perceived
quicker and therefore at greater distances than hazards that are less
conspicuous. At the extremes, hazards that are highly conspicuous should
be seen at the greatest possible distances and hazards that are perfectly
camouflaged will not be seen or recognized at all.
In conclusion, since it is clear that hazards such as pedestrians, objects
and obstructions that are more conspicuous can be seen earlier and
therefore at greater distances than hazards that are less conspicuous, and
since it can be shown that inconspicuous or perfectly camouflaged hazards
may not be seen at all, then it follows that hazards that are less conspicuous
can in fact be shown to be the primary contributing cause of being hit by
vehicles with drivers exercising ordinary care with respect to lookout.
Conspicuity, Visibility, Accident Reconstruction
C17
Facial Comparison of Persons Using
Non-Standardized Image Material
Arnout C. Ruifrok, Ivo Alberink, PhD, Mirelle I Goos, MSc, and Jurrien
Bijhold, PhD, Netherlands Forensic Institute, Volmerlaan 17, Rijswijk,
2288 GD, Netherlands
The goal of this presentation is to describe quality issues and a
standardized procedure to perform facial comparisons, in order to make the
process of performing facial comparison as objective and consistent as
possible.
humanity by presenting quality issues and methods for visual comparison.
Facial recognition and comparison is still one of the ‘promising’
biometric systems considered, and even implemented, in security systems.
Error rates at settings with equal percentage false accepts and false rejects
(equal error rates, EER) of 5-10% are considered reasonably good,
especially with long time-lapse (a year or more) between enrollment and
surveillance. Four aspects of image acquisition are of major importance for
automated facial recognition: background, lighting, camera position, and
facial expression. The more variability in one of these factors, the higher
the error rates. Most images of surveillance cameras are taken under suboptimal conditions at best: backgrounds vary, lighting is poor, camera
position is mostly with a downward angle, facial expressions are variable,
and added to that people wear hats or disguises, and finally most images are
saved at high compression levels.
It is clear from the above, that biometric systems for facial recognition
are not appropriate for forensic applications. Although maybe useful in the
investigational stage, the error rates, even in reasonably well-standardized
images, are too high for final legal proof.
This means that visual matching does the final confirmatory check of
the identity of a person. Especially in criminal cases, where the available
evidence mostly is limited, but the correct identification of the criminal is
crucial, the final decision will also be made by means of a visual check.
However, this process is still subjective, and clear guidelines on how to
perform such a comparison are hard to find. Therefore, the authors have
developed procedures to standardize facial comparisons as much as
possible depending on the material available.
Preferably, a comparison will take place with pictures taken from the
same camera position, and from the same distance. If a person and original
camera equipment are available for comparison pictures, a three-point
matching method is used to position the person according to the available
pictures, and a more robust comparison can be made. This also provides
the opportunity to validate the comparison using the actual system: also
136
5-6 foils are imaged under the same circumstances, and analysis results of
the foils and the suspect are compared. This will give an indication of the
reliability of the facial comparison with the available system set-up.
If the original equipment is not available, or the position of the person
is hard to estimate, a 3-D laser scanner can be used to build a 3-D model,
followed by calculation of the most likely camera position and properties.
This provides the opportunity to position suspect and perpetrator images
alike, improving the comparison process.
However, in many of criminal cases, no additional comparison
pictures can be made (e.g., when a crime suspect is still at large), and
comparisons have to be performed using pictures from different time
periods, camera positions and camera distances. Therefore, the authors
have developed a procedure to standardize facial comparisons as much as
possible. The method comprises description of general information
concerning the material, and a step-by-step comparison and scoring of
general facial features (contours, relative measures, and positions), specific
features (eyes, nose, ears, mouth, neck and throat), facial lines, folds and
wrinkles, and typica like scars, moles, tattoos, and piercings. This approach
has been compared the approach used in other countries. From this study
it is clear that although the general approach is similar, the level of detail
and the reporting of results can be quite different in different countries. In
general it is recognized that direct measurements are not suitable for facial
comparison, that consistent judgment of images is hard to achieve, and that
there is a lack of statistical data for facial features. Implications and
possible solutions to some of these issues are presented.
Facial Comparison, Identification, Objectivity
C18
Body Length Estimation From Surveillance
Video: Procedures and Validation
Bart Hoogeboom, MS, Ivo Alberink, PhD, Mirelle I. Goos, MS, Derk
Vrijdag, MS, and Jurrien Bijhold, PhD, Netherlands Forensic Institute,
Volmerlaan 17, Rijswijk, 2288 GD, Netherlands
The goal of this presentation is to describe procedures and validation
techniques for estimation of the height of a person in surveillance video.
The Netherlands Forensic Institute uses a technique with 3-D computer models to estimate the length of a person in a surveillance video. The
3-D-computer model is made with commercial photogrammetry software
from photos taken at the scene. The model is then imported into commercial software for 3-D modeling and animating. The model can be
viewed from every desired perspective in this software. This implies that
the model can also be viewed from the same perspective as the camera that
has taped the (video) image. To find this perspective, the software is provided with a camera match algorithm. This algorithm calculates the
position and field of view of the camera through the similarity of points
between the image and the 3-D model. The user in both the image and the
3-D model must point out these points. The model can now be looked at
through a virtual camera with the video as a background. By positioning a
3-D modeled object in the 3-D space in such a way that they fit the person
in the image, the height of the person is measured.
Mistakes and inaccuracies in this procedure are caused by:
• The quality of the 3-D model
• The choice of the virtual camera
• Uncertainties in the interpretation of the (video) image.
(Which pixel on which video line belongs to a certain point
of the 3-D model?)
Inaccuracies in the 3-D model will systematically affect all the measurements. A mistake or inaccuracy in the interpretation of the (video)
image can be random, but also a systematical error from the investigator.
For this reason it is wanted that the camera match and the measurement is
repeated several times by several investigators.
* Presenting Author
Reference images are made to validate the measurements and to get a
better understanding of the measuring errors. This means shooting images
with the same equipment and at the same location that was used for the
questioned images.
The shooting takes place under controlled circumstances and the
camera view is checked for changes. If the camera view has been changed
compared to the questioned image, the view will be restored as good as
possible. Reference objects with a known size and location are placed in
view of the camera. Also, several persons will stand still at known locations. At the lab of the Netherlands Forensic Institute, these reference
images are treated the same way as the questioned images.
When performing a height measurement on a person in a (video)
image it is necessary that the person be fully displayed. In other words:
both the head and the feet of the person should be visible in the image. The
gait and pose of a person is of great influence to the result of the height
measurement. For this reason the aim is to use an image in which the
person stands tall and still. When this is not the case an extra error should
be taken into account for the height measurement. The quantity of the error
for not standing tall can only be estimated for every individual case.
However, the influence of the gait of a person to the height measurement
has been studied by several people [1,2]. These studies show a maximum
variation of the measured height of a person of 8 cm.
At this moment there is a study going at the Netherlands Forensic
Institute to the influence of the pose of a person, camera view, lighting, and
also interpretation of the images by the investigator on the result of height
estimation. One of the experiments includes measurements on about
twenty people shot by the surveillance cameras from the institute. On the
day they were shot on camera and where they were also measured in real
live by the investigators. The purpose of this study is to narrow the errors
in future cases on height measurements.
Literature:
[1] David Compton, Clair Prance, Mark Shears and Christophe Champod,
A Systematic Approach to Height Interpretation from Images, in
Proceedings of SPIE Vol. 4232, Enabling Technologies for Law
Enforcement and Security, 2001
[2] Antonio Criminisi and Andrew Zisseman, Luc van Gool, Simon
Bramble and David Compton, A new approach to Obtain Height
Measurements from Video, in Proceedings of SPIE Vol. 3576,
Investigation and Forensic Science Technologies, 1998
Height Measurement, 3-D Computer Models, Surveillance Video
C19
Questions About the Integrity and
Authenticity of Digital Images: A Review
of Case Reports From the Netherlands
Forensic Institute
Zeno Geradts, PhD*, Derk Vrijdag, BSc, Ivo Alberink PhD, Mirrelle I.
Goos, MSc, and Arnout Ruifrok, PhD, Netherlands Forensic Institute,
Volmerlaan 17, Rijswijk, 2288 GD, Netherlands
humanity by developing standard operating procedure for determining the
authenticity and integrity of a digital image file.
For forensic casework the question of authenticity has to be answered
if a certain image has allegedly been made with a specific digital camera.
Another question that may be asked is if two images have been made with
the same camera. In order to answer this question pixel defects, and information from the headers and footers of image files can be used.
Furthermore, the method of examination of pixel defects combined with
headers and footers is useful for integrity research: finding traces of manipulation (e.g. cut and paste) of the images.
A digital image is composed from a matrix of pixels (picture elements). For capturing a digital image a Charge Coupled Device (CCD) is
* Presenting Author
used in a camera. When manufacturing large CCD arrays, they sometimes
contain defects. A defect is visible in the image as a pixel defect if the CCD
element has a different light sensitivity compared to the surrounding CCD
elements.
For the examination of pixel defects the authors have developed a
standard operating procedure in forensic casework. The examination has
two approaches. If the camera is available, test images will be made with
the camera with a white, gray, or a black surface. These images are used as
a reference set. If the camera is not available, one set of images is used as
reference set.
In some casework the pixel defects could be visualized without
averaging or image processing, since they were visible in the images themselves without any processing. However, for visualizing the pixel defects
it is often necessary to add and average the intensities of the images. As a
result of this, fluctuations in the images due to the image itself will be
averaged. In order to visualize the pixel defects a filter, for instance a
median filter can be used.
The locations of the pixel defects in the reference images are
compared with the location of the pixel defects of the questioned images.
If the locations of the pixel defects agree with each other, this provides
strong support for the hypothesis that they have been made with the same
camera. The conclusions are not quantitative however, since not enough
statistical data is available from the randomness of pixel defects.
Conclusions from pixel defects are reported as level of support to the
hypothesis that an image has been acquired with a specific camera, and/or
the level of support to the hypothesis that the have been acquired by a
different camera. The following levels of support can be given: no support,
limited support, moderate support, strong support, and very strong support.
In cases with similar support to both hypotheses, no conclusion can be
drawn due to discrepancies.
Header and footer-information is often available in the digital files
received. The information in the headers and footers is not visible in the
image itself, however by using software (for example a hex viewer) the
information can be made available. In JPEG images from cameras this
information often provides camera settings and brand and type of the
camera itself, and sometimes provides information with which software the
image has been edited. It is possible to modify the header and footer
information by using software, so for forensic casework the examiner has
to be aware of this possibility before drawing conclusions. If the header
provides information that the image has been taken with a specific camera,
it is possible that someone has altered the contents of this header, and that
the picture actually has been taken with a different camera.
The results of examining pixel defects can be combined with
information from the headers and the footers, for determining the integrity
and authenticity of images. Several cases that have been received will be
discussed in the presentation, and a review is given of the results reported.
Image Processing, Pixel Defects, Standard Operating Procedure
C20
Preserving Audio Quality When Converting
Digital Audio File Formats
Kenneth W. Marr, BSEE, MS*, and David J. Snyder III, BSET*, Federal
Bureau of Investigation, Forensic Audio, Video and Image Analysis Unit,
Engineering Research Facility, Quantico, VA 22135
The goal of this presentation is to describe techniques to convert
digital audio files from one format to another and to review precautions and
limitations to observe when converting audio files so that the maximum
audio quality possible is maintained after conversion.
humanity by demonstrating to the digital evidence examiner the knowledge
of the procedures and limitations to consider when converting digital audio
files so that the maximum audio quality is maintained.
137
Analysis of digital audio files is becoming more and more common
for law enforcement in today’s Internet world. Cell phone technology,
Internet communications, and commercial digital telephone service are
examples of the numerous occurrences in which proper digital analysis
procedures and the limitations of digital audio formats must be recognized
by the digital evidence examiner. Digital forensic tools must be used with
skill, the characteristics of the digital file format under question must be
identified, and the proper steps must be followed in order to convert a
digital audio file from one format to another while maintaining the
maximum audio quality.
Selection of proper digital analysis tools will include a forensically
approved digital hex editor program; a high quality computer-based audio
analysis application, and a high-quality computer and operating system.
The work on this presentation is based on a Windows 2000 operating
system. The reasons for converting digital audio files from one format to
another could include the needs of the requesting agency, errors in the audio
file rendering it unplayable, or a variety of many other reasons. The goal
of the forensic audio examiner in this conversion is to maintain as much
audio quality as possible after the conversion.
The format and characteristics of the digital audio file to be converted
must be determined. Then the format and characteristics of the converted
file must be determined. This can be accomplished by use of a digital hex
editor program to identify file characteristics in the header portion of the
file. This information could include the type of file, sampling rate, bit rate,
Codec, compression characteristics, size of header information as well as
the size of the data portion of the file. Comparison of this header information is essential both before and after file conversion. One of the most
important features to consider when converting digital audio files is the
effect of compression. Since many digital audio files are already compressed when received, case-by-case analysis is required before using any
compression algorithms. Nevertheless, preserving audio quality should
remain the most important consideration for the digital evidence examiner.
Digital Evidence, Digital Audio, File Conversion
C21
Case Study - Imaging the Memory
of a Digital Audio Recorder
Kenneth W. Marr, BSEE, MS*, David J. Snyder, BSET, and Jeffrey
Edwards, MSEE, Federal Bureau of Investigation, Forensic Audio,
Video and Image Analysis Unit, Engineering Research Facility,
Quantico, VA 22135
The goal of this presentation is to review the procedures and precautions for making an exact digital copy of the memory contents of a
handheld digital audio recorder.
humanity by providing to the digital evidence examiner procedures and
precautions for making an exact digital copy of the memory contents of a
digital audio recorder.
Commercial digital audio recorders are used throughout society today.
This case involved a commercial off-the-shelf digital recorder that the
submitting agency requested to be examined to determine the contents of
the recorder’s memory. Since there were questions involving alleged
alterations of the recorded information, an image of the recorder’s memory
was required. This is the same concept in use by computer analysis
response teams when downloading the contents of a computer’s hard drive.
The image of the hard drive is an exact digital copy of the contents of the
original drive. This allows the examiner the opportunity to review and
analyze the image contents without affecting any parameters of the contents
of the original drive. Potentially vulnerable information on a hard drive
includes file names and the dates/times files were stored.
Since this case involved an unknown recorder system, a thorough
search of law enforcement and Internet forensic sources was made to find
existing forensic tools which could be used to image the recorder memory.
138
None were found but valuable forensic consultation information was
obtained. It was determined that a new procedure must be validated and
approved before the image could be obtained. The same make and model
recorder with the same characteristics and features was used to conduct the
validation testing.
Established forensic principles of write-protection, data verification
by use of MD5 Hash calculations, and use of validated procedures were
followed. Consultation with the recorder manufacturer confirmed the
design and operating specifications. Digital tools used in the validation
included a forensically approved digital hex editor program, a commercial
monitoring utility for USB interfaces, a computer utility written to query
the recorder memory contents, and a high-quality computer and operating
system. All steps of the procedure were conducted with repeated tests
using the same make and model recorder to verify and validate the
procedure. MD5 Hash calculations confirmed that the image of the test
recorder memory matched the contents of the test recorder.
After validation and approval of the procedure, the memory content of
the original digital recorder was downloaded and the exact image of the
recorder’s memory was returned to the requesting agency.
Digital evidence is taking a more and more important role in law
enforcement in today’s society. Analysis of digital files requires a high
degree of knowledge and expertise to maintain the integrity of the memory
contents of digital storage systems.
Digital Evidence, Computer Forensics, Computer Image
C22
Temperature Tests on Halogen Lamps
Harold E. Franck, BSEE, PE*, and Darren H Franck, BSCE, PE,
Advanced Engineering, 4713 MacCorkle Ave SE, Charleston, WV 25304
After attending this presentation, attendees will gain knowledge about
the dangers and temperatures of halogen lamps and their propensity to start
fires.
humanity by revealing the fire propensity available when halogen bulbs are
used in lamps.
Halogen lamps come in a variety of shapes, sizes and wattage options.
These lamps are available for a variety of applications including medical
and dental, car lamps, as well as household and shop lights. These lamps
are filled with halogen gas, which reacts with the lamp filament producing
a brighter light source than an incandescent light bulb. Generally, halogen
lights are more efficient and have a longer life span than incandescent light
sources and are designed to fit most applications. Typical wattage of
halogen lamps ranges from 10 watts at 6 volts to 5000 watts at 420 volts.
Many of the household type halogen lamps are classified according to their
tubular double-ended shape as T-3. This investigation centers on test measurements conducted on T-3 style halogen lamps and a comparison to
standard incandescent lamps.
A standard incandescent light bulb in the 60 to 75 watt range produces
temperatures that vary over the surface of the bulb. At the base the temperature is approximately 120° F while at the maximum radius the temperature climbs to 180° F. This temperature at the maximum radius of the bulb
explains why, although very hot to the human touch, a lit incandescent light
bulb can generally be unscrewed from its socket and changed.
Surprisingly, the temperature at the very top or tip of a standard incandescent light bulb is approximately 350°F. Tungsten-halogen lamps are
also incandescent (filament) lamps but are significantly different from
standard or conventional lamps in size and design. Halogen lamps operate
on the practical application of the halogen regenerative cycle in filament
lamps. Iodine and bromine gas, members of the halogen family of gases,
are the most commonly used fillers for these lamps. As the lamp burns, the
halogen gas combines with the tungsten that is evaporated from the filament. The circulation of the gas inside the bulb deposits the tungsten back
on the filament instead of inside the bulb wall. This regenerative effect
* Presenting Author
keeps the bulb wall clean and allows the lamp to essentially deliver a
constant light output throughout its life.
In comparison to standard filament lights, halogen lamps may achieve
bulb temperatures in excess of 900° F. Consequently, most halogen light
fixtures have supposed safety features that isolate the bulb from the
surroundings by the use of lenses or guards. In some of these halogen lamp
designs, the lenses or guards are insufficient so that significant temperatures may be achieved that will ignite combustible materials such as clothes
and paper. Owing to the lamp temperatures, halogen lamps use quartz
rather than glass for the lamp bulb. Tests conducted on halogen lamps
varying from 150 watts to 500 watts revealed a serious risk of fire on two
common light fixture designs.
3.0
4.0
Halogen Lamp, Temperature, Ignition
C23
Outdoor Bus Duct - Maintenance,
Diagnostics, and Failures
Helmut G Brosz, BASc, PEng*, and Peter J.E. Brosz, BEng, PEng,
Brosz and Associates, 64 Bullock Drive, Markham, Ontario L3P 3P2,
Canada
The goal of this presentation is to emphasize the importance of testing
and inspection of surviving outdoor bus duct for the forensic engineer;
highlight some common manufacturing defects; and show common failure
modes and resulting injuries.
humanity by demonstrating to forensic electrical engineers faced with
outdoor bus duct failures awareness of some newly discovered causes of
bus duct failure and the manner of detecting incipient failures.
Modern bus duct operating at 120/208/480 and 600 Volts at current
rating of 400 – 4000 Amps is generally of the low impedance type, feeder
or plug-in-type utilizing one or two bolts per joint type of construction. The
conductor is flat ¼’’ thick plated copper or plated aluminum 3, 4 or 5 wire
insulated with PVC or epoxy and sometimes with an additional Mylar sheet
or tape. The enclosure is often powder coated, painted aluminum or
painted steel.
The newer versions of bus duct are constructed in a ‘’sandwich configuration’’ and consist primarily of bus bars coated or dipped in either an
epoxy or PVC resin. This type of construction has certain benefits and disadvantages. For instance, one draw back is that certain material defects are
not readily detectable using commissioning / maintenance test procedures.
The bus duct is constructed to one or more of the following Standards
UL 857 or CSA C22.2, No. 27.
Outdoor bus duct does not accept plug-in switches.
Outdoor bus duct is usually installed in a vertical or horizontal manner
between transformer and buildings. Outdoor bus duct is expected to be
weather sealed except for certain drainage features.
1.0 Failure Modes and Reasons
2.1
A common failure mode is the hot spot fault at a joint
or connection. It is often attributed to misalignment,
defective manufacture and loose or corroded connections.
2.2
Insulation failure near or at the joints due to defective
manufacture, lack of clearances or damaged insulation.
2.3
Damage caused by entry of water, cement, slurry rain
and defective weatherproofing.
2.4
Multiple pinholes in the insulation in the presence of
water in horizontal installations.
2.5
Bolt hole penetration not waterproofed.
2.6
Incorrect orientation of the bus duct.
2.7
Condensation of moisture.
2.0 Older Bus Duct
Older bus duct is often of the higher impedance type with larger
spacing between phases. It may be enclosed or ventilated. The
* Presenting Author
5.0
6.0
conductors are often supported on separate insulating spacers
exposed to rain, snow, etc. Failures have occurred at support
points.
Injuries
Injuries seldom occur on outdoor bus unless being worked on
while energized. In these instances, workers are very close to the
fault, which usually manifests itself as a sustained electrical arc,
which produces intense searing heat along with molten metal
ejecta. The incidence of shock and electrocution occurs less
often on outdoor bus duct than indoor bus duct.
Consequential Damages
The most serious outdoor bus duct failures usually result in
major building fires and lengthy business interruptions.
Sometimes a particular defect exists in an incipient form
throughout the entire bus duct system, necessitating shutdown
with resulting business interruption in order to take corrective
actions on the entire run. Malfunction of protective equipment
such as circuit breakers and relays usually increase the degree of
damage.
Tests
Infrared scans, heat runs, insulation resistance, capacitance and
dissipation factor/power factor, conductor resistance, plating and
insulation thickness, alignment, correct installation, weather and
water resistance tests and ‘’holiday’’ tests are a menu of tests
often used by the forensic engineer.
Case Studies of Bus Duct Failures
6.1 Cement and water slurries
6.2 Tools
6.3 Insulation failure and holidays
6.4 Manufacturing defects
6.5 Hot spots
6.6 Misalignment
6.7 Condensation
Electrical Bus Duct, Arcing, Product Liability
C24
New Standards in Forensic
Engineering & Science
Harold E Franck, MSEE, PE*, Advanced Engineering, 4713 MacCorkle
Avenue, SE, Charleston, WV 25304; and Helmut G Brosz, BASc, PEng,
Brosz and Associates, 64 Bullock Drive, Markham, Ontario L3P 3P2,
Canada
After attending this presentation, attendees will gain knowledge on the
current status of standards available to forensic engineers and the need for
further standard development to deal with Frye standard and Daubert
challenges.
humanity by demonstrating the use of recognized standards in the practice
of forensic engineering, which allows the practitioner’s opinions and results
to withstand court challenges.
Goals of a forensic engineer/scientist include safeguarding the life,
health, property, and welfare of the public, establishing and maintaining a
high standard of integrity, skill, and practice in the profession of forensic
engineering. The rules of professional conduct for engineers dictate that
the forensic engineer shall be completely objective and truthful in all
professional reports, statements and testimony. He shall include all
relevant and pertinent information in such reports, statements, and
testimony. When serving as an expert or technical witness before any court,
commission, or any other tribunal, he shall express an opinion only when it
is founded upon adequate knowledge of the facts in issue, upon a
background of technical competence in the subject matter, and upon honest
conviction of the accuracy and propriety of his testimony. These statements
or similar ones are generally found in the rules of conduct for engineers in
the United States and Canada.
139
In light of these requirements of conduct, the forensic engineer can
ensure that his opinions, reports, and testimony stand on solid ground if
they are based on recognized standards. In the last few years, forensic engineers and scientists have been subject to court challenges as to their
opinions. These challenges originally stem from a court case in 1923 that
established the minimum standard required for the admission of expert testimony in federal cases. The Frye Standard, as it has become known,
requires the expert to use data and methodology “generally accepted” by
other experts. A more recent landmark case is the Daubert decision concerning birth defects that were allegedly caused by the mother’s use of the
anti-nausea drug, Bendectin. The defendant’s, Merrill-Dow, motion for
summary judgment was granted by the trial court because Daubert’s
experts relied on a technique that the court felt had not received general
acceptance within the scientific community. Furthermore, in support of its
finding of no general acceptance, the court observed that the proffered
findings had not been published or subjected to peer review. The appellate
court affirmed the lower court’s decision based on the Frye Standard.
However, the Supreme Court of the United States found that the Federal
Rule of Evidence 702, issued in 1975, had superseded the Frye Standard
and that “general acceptance” was not the sine qua non of admissibility.
Rather, the Supreme Court stated, any reliable and relevant scientific evidence was admissible. For guidance, the Court then listed some suggested
reliability criteria, as follows:
1. Has the theory or technique underlying the proffered evidence
been tested and found to have a reasonably low error rate?
2. Has the theory or technique been subject to peer review and
publication?
3. Are there recognized standards for applying the theory or
technique?
4. Does the theory or technique enjoy general acceptance in the
scientific community tantamount to the Frye Standard?
The Court emphasized that no one of these criteria needed to be satisfied and that they may not apply to all types of scientific evidence. In any
event, all federal courts are now governed by this Supreme Court decision.
Many states have also accepted the “Daubert Standard,” though there are
still a sizeable number that have continued to apply the Frye Standard and
a few that follow neither standard.
Standards in forensic engineering have two main goals: to educate the
practitioner and to codify the recognized practice in a particular field.
Consensus standards, such as those promulgated by ASTM, ensure that the
procedures followed by the investigating engineer follow recognized and
well-documented outlines. These procedures aid the investigator by
ensuring that pertinent items are addressed, that available evidence has
been gathered, and that a scientifically provable hypothesis has been
developed and tested. When properly applied, standards and guides are an
invaluable aid to the practicing forensic engineer. These guides also place
the investigator’s opinions on solid foundations with respect to the laws of
the land as dictated by the Code of Federal Regulations. Various standards,
such as American National Standards Institute (ANSI) Institute of
Electrical and Electronic Engineers (IEEE), American Society of Civil
Engineers (ASCE), Society of Automotive Engineers (SAE), and many
others serve to support the forensic engineer’s work and can provide a
sound basis for his forensic opinions as well as for having those opinions
accepted into evidence at trial.
Forensics, Standard Development, Frye Standard
C25
Analysis of Case Factors in a
Surface Mine Electrocution
James A. Ruggieri, PE*, 10710 Timberidge Road, Fairfax Station,
VA 22039
application of engineering judgment.
140
humanity by identifying innovative techniques, critical thinking, and application of engineering to judgments and conclusions in forensic sciences.
In late November 1999, a 44-year-old dredge operator working a
gravel pond from a small metal boat, was electrocuted when he tightened a
chain clamp around one phase of an energized 440 Volt, 3-phase dredge
service power conductor fed from a corner-grounded delta transformer.
The operator was in the process of clamping the dredge rubber discharge
line to a metal section of pipe when the power conductor was drawn up
with the chain clamp. The operator had a total of two years and four weeks
mining experience, all at this mine, as a dredge operator, yet had not
received electrical safety and hazard recognition training in accordance
with Mine Safety Health Administration regulations (MSHA) 30 CFR
Part 48.
After struggling for some time to get the chain clamp to seat, the
operator hit the chain clamp handle with a pipe to get the chain’s clamping
teeth to seat into the chain links. The chain clamp finally seated and the
operator began to tighten the clamp.
An assistant on the boat reported that he then heard the operator make
grunting noises while shaking violently. Recognizing that the operator had
contacted a power line, the assistant failed in his attempt to push the
operator free, and fearing for his life, entered the water and swam to a
nearby floating stanchion. The assistant climbed onto the float and
reportedly experienced “tingling” sensation, and when he looked back,
observed arcing in several locations.
This paper provides an analysis of case factors used in a professional
negligence and wrongful death case on behalf of the Plaintiff against two
defendants, the mine owner (employer) and an electric contractor tasked in
performing annual safety inspections of the mine facility as required by
MSHA. This analysis shows that both the employer and the contractor had
ample knowledge of substantive electric risk, and provides an axiomatic
breakdown of case factors shown to be recurring in such incidents. This
analysis evaluates system grounding deficiencies, deficient personnel
training and personnel protective equipment policies and procedures, and
in general, a grossly deficient system architecture. Additionally, this paper
identifies impacts of federal regulatory policies, while evaluating rulemaking politics and enforcement of the provisions of the 1977 Mine Safety
and Health Act.
Electrocution, Grounding, Surface Mine
C26
Forensic Investigation of a Gas
Phase Explosion in Building
Poh Ling Chia, BSc*, Ming Kiong Michael Tay, PhD, MBA, and Kim
Lian Janice Kuah, MSc, Health Sciences Authority, 11 Outram Road,
Singapore, 169078, Singapore
Through the systematic and detailed examination of the scene and
physical evidence collected, the goal of this presentation is to provide the
examiner means to identify the fuel source from a number of potential
sources and reconstruct the sequence of events that led to the gas phase
explosion in a building
humanity by illustrating how forensic scientist can complement structural
design and civil engineers as well as gas safety experts in determining the
cause of gas-phase explosion.
Background: The explosion occurred in a design and advertising
office on the second floor of a seven-story flatted factory building of reinforced concrete structure with flat roofing. The occupier of the affected
unit carried out the manufacture of advertising signs and displays within the
premises, which was partitioned into an office area and a production area.
Four persons were killed and another two workers were injured in the
accident.
* Presenting Author
Prior to the accident, two of the deceased were involved in the
replacement of the oxygen cylinder and the usage of the oxygen-acetylene
equipment in the production area.
Eyewitnesses reported seeing a dazzling brightness immediately after
the initial explosion, suggesting an oxygen-rich fire. Flames were also seen
shooting out from one of the liquefied petroleum gas (LPG) cylinders in the
office during fire fighting.
Scene Examination: The explosion/fire totally destroyed the factory
unit. The concrete wall, window frames, doors, and gates at its main
entrance were displaced from their original positions. The concrete wall
was found to bulge outward, attesting to an explosion from within the
factory unit. Along the corridor of the affected factory unit, partially burnt
remains of several metal racks, an air compressor (used for spray painting),
and a number of paint containers were found. The damages observed to the
areas within close proximity to the affected unit included displaced doors
of the passenger/cargo lifts, shattered window panes in neighboring units,
and broken windows of cars parked downstairs.
Within the affected factory unit, partially burnt remains of paint containers and solvents were found at several locations at its production area.
Tools such as an electric saw and drilling machine were also found at the
scene. At the locality within the production area where the oxygenacetylene equipment was claimed to be used at the time of accident, a circular indentation of about 20 cm diameter was observed on the floor. Also,
impact marks were noted on the wall surface nearby, probably caused by
fragments from the explosion.
A badly dented acetylene cylinder was found, among the debris, at
close proximity to the circular indentation. The shattered remains of a
second cylinder (believed to contain oxygen prior to the accident) were
found at several locations within the factory unit. The damaged remains of
two sets of regulators and flexible gas hoses were also recovered from the
scene. Two cylinders containing liquefied petroleum gas (LPG) were
found within the affected factory unit. No flashback arrestors, non-return
valves and torch were recovered from the scene.
Potential sources of gas that led to the explosion include:
• A leak of flammable gases from the LPG cylinders.
• A leak of acetylene from the acetylene cylinder.
• The oxygen cylinder and/or hose being contaminated with
flammable gases.
Findings:
(a) LPG cylinders
The on/off gas valves of both cylinders were found to be in the close
position. The plug within one of the valve was found to be burnt. One of
its ends had expanded causing the seat disk within the plug to drop by
approximately 0.3cm from the top. This resulted in poor sealing and gas to
be leaking out from the on/off gas valve even though it was close. The
above findings indicate that both LPG cylinders were not in use before the
accident and any gas leakage was the result of heat from the fire. The
leaking gas resulted in flames, which were seen to be emitting out from one
of the cylinders by the firefighters.
(b) Acetylene cylinder, pressure regulator, and red hose
The on/off gas valve was found to be in the close position. It was
clotted with melted rubbery material from the safety plug within the
cylinder. This was consistent with effects from external heating. The
pressure release valve was also found to be damaged by the heat from the
fire allowing acetylene to escape into the atmosphere.
The pressure regulator believed to be attached to the acetylene
cylinder was found to be relatively intact. Both the cylinder and working
pressure gauges remained fixed to the regulator body. One of the gauges
was found to be bent forward indicating external force acting on it.
The lengths of red acetylene hoses had damaged ends and were found
to be intact with burn marks along their lengths. These damages were consistent with those caused by external forces and heat.
The above findings indicate that the acetylene cylinder was not in use
before the incident and any gas leakage from the cylinder was the result of
heat from the fire.
* Presenting Author
(c) Oxygen cylinder metal fragments, pressure regulator, and blue hose
The on/off gas valve was found to be in the open position. Four of the
metal fragments physically fitted to form the base of the cylinder with a
diameter of approximately 20 cm. This was consistent with the size of the
indentation mark found at the scene. One of the fragments was found to
bend outwards indicating an outward force from within the cylinder.
The pressure regulator believed to be attached to the oxygen cylinder
was found to have its regulator bonnet and working pressure gauge blown
off from the regulator body. Soot and burn marks were observed within the
bonnet and regulator indicating internal burning within the regulator.
The blue oxygen hoses were severely damaged with splits and burn
marks along its lengths consistent with those caused by internal bursting
forces and heat.
Damages observed on the damaged oxygen cylinder metal fragments,
pressure regulator and blue hose indicated that the cylinder was used during
the time of incident and that flashback had occurred along the lengths of
blue hoses causing them to split. Burning and excessive pressure within the
regulator caused the bonnet to be detached and the working pressure gauge
to be blown off. A powerful outward force from within the cylinder caused
it to fragmentize.
The above findings indicate that both the LPG and acetylene cylinders
were not in use prior to the explosion. The source of gas that led to the
explosion was hence likely to be from the oxygen cylinder and/or hose.
Possible causes for the explosion:
1. Contamination of the oxygen hose by flammable gases from
paint cans, acetylene or other sources to within explosive limit
resulted in an explosion when the torch was ignited.
2. Contamination of the oxygen cylinder by flammable gases.
3. Absence of safety devices e.g. flashback arrestor, non-return
valves in the oxygen-acetylene gas equipment resulted in the
explosion of the oxygen cylinder.
Typical set-up and operation of oxygen-acetylene equipment: The
oxygen-acetylene equipment was primarily used for cutting, welding,
brazing, or heating of metals. A typical set-up of oxygen-acetylene
equipment comprises oxygen and acetylene cylinders, gas regulators,
flashback arrestors, hoses, non-return valves, and a torch. A gas regulator
serves to regulate/reduce the pressure of the gas coming out from the
cylinder before feeding to the hose/torch. A flashback arrestor prevents the
flashback of in the torch/hose from propagating back into the regulator and
gas cylinder, which could lead to an explosion. The function of a nonreturn valve is to prevent the gas from flowing back into the cylinder. The
internal pressure of an oxygen cylinder (when full) is around 150 bar and
the internal pressure of an acetylene cylinder (when full) is around 20 bar.
The two types of gases are channeled via hoses to a torch where the gases
are mixed and ignited.
The low-pressure control valves are typically adjusted to 2 bars for
oxygen and 0.2 bars for acetylene before the valves are opened to release
the gases into the hoses. The oxygen valve at the torch was then opened
momentarily to clean the nozzle and closed back. The acetylene valve
(about ½ turn) will then be opened, followed by the oxygen valve (about ¼
turn). The torch is then ignited. To stop the torch, the torch’s acetylene
valve was closed followed by the oxygen valve in order to prevent
acetylene from flowing into the oxygen hose. Due to the potential fire
hazards associated with oxygen-acetylene equipment and the strict protocol
required in its operation, only trained personnel should be allowed to
operate the equipment.
Tracing the source for contamination: Experiments conducted on an
oxygen-LPG equipment not equipped with non-return valves or flashback
arrestors showed that if the internal pressure of the LPG cylinder (when
full) was higher than that of the oxygen cylinder (when it was near empty),
and if the torch nozzle was obstructed, it was possible for the LPG to flow
into the oxygen cylinder. The oxygen in the oxygen cylinder would thus be
contaminated with LPG.
Investigations showed that no non-return valve and flashback arrestor
were connected to the oxygen-acetylene equipment used in the affected
141
company. Also, the company was not licensed to carry out hot works
within the office premises; hence the workers might not be trained in the
operation of oxygen-acetylene equipment. The absence of these safety
devices coupled with untrained workers using the equipment may have
resulted in acetylene contaminating the oxygen hose and cylinder resulting
in the explosion.
Gas Phase Explosion, Oxy-Acetylene Gas Equipment,
Flashback Arrestor
C27
Lethality of Taser Weapons
James A. Ruggieri, PE*, 10710 Timberidge Road, Fairfax Station,
VA 22039
Upon completion of this presentation, attendees will understand applications of some engineering applications.
humanity by identifying innovative technologies, critical thinking and
application of engineering to judgment and conclusions in forensic science.
On April 28, 2004, Montgomery County Police MD police responded
to a disturbance. A 45-year-old mentally ill adult, 6’4”, 275-pound son
pushed his elderly mother when he became agitated when a car carrying
Chinese delivery food parked in front of the suspects house. The driver left
the headlights on and ran next door to deliver food. Family members said
the suspect apparently believed the car carried agents comi

Volume 11 - American Academy of Forensic Sciences

Transcription

Similar documents

Alphonse Bertillion - Hicksville Public Schools / Homepage

perceived quality of a medical image: evaluation and

About OMICS Group

EasyPure Genomic DNA Spin Kit

(pdf of slides).

Evidence Technology Magazine – May, 2010

London Philatelist: Volume 124, Number 1423

Handout - cme.ucsf.edu

Check out the newest Nebraska IAI Newsletter!

Summer 1992 - California Association of Criminalists